I'm trying to use the ToolValidator function to update the content of the drop down lists. I've followed the steps from https://blogs.esri.com/esri/arcgis/2011/08/25/generating-a-choice-list-from-a-field/ but need to take it a step further and populate the 'HA' drop down list with the values in the 'HarvestArea' field that start with the 'ForestID'. Any help on how to format this in the ToolValidator script (see below) would be much appreciated! import arcpy class ToolValidator ( object ) : """Class for validating a tool's parameter values and controlling the behavior of the tool's dialog.""" def __init__ ( self ) : """Setup arcpy and the list of tool parameters.""" self . params = arcpy . GetParameterInfo ( ) self . fcfield = ( None , None ) def initializeParameters ( self ) : """Refine the properties of a tool's parameters. This method is called when the tool is opened.""" return def updateParameters ( self ) : """Modify the values and properties of parameters before internal validation is performed. This method is called whenever a parmater has been changed.""" if self . params [ 0 ] . value and self . params [ 1 ] . value : fc , col = str ( self . params [ 0 ] . value ) , str ( self . params [ 1 ] . value ) if self . fcfield != ( fc , col ) : self . fcfield = ( fc , col ) self . params [ 2 ] . filter . list = [ str ( val ) for val in sorted ( set ( row . getValue ( col ) for row in arcpy . SearchCursor ( fc , fields = col ) ) ) ] if self . params [ 2 ] . value not in self . params [ 2 ] . filter . list : self . params [ 2 ] . value = self . params [ 2 ] . filter . list [ 0 ] def updateMessages ( self ) : """Modify the messages created by internal validation for each tool parameter. This method is called after internal validation.""" return

I looked at the blog post mentioned in your post. I believe you need to add an additional parameter for the name of the second field. The following code gives you an idea of what to add/modify in the validator section. Once you have the value of the first field, it will be used in a where clause to filter the results of the second field selection. Note that the code does not check for field types, so the where clause may not be properly formed. import arcpy class ToolValidator ( object ) : """Class for validating a tool's parameter values and controlling the behavior of the tool's dialog.""" def __init__ ( self ) : """Setup arcpy and the list of tool parameters.""" self . params = arcpy . GetParameterInfo ( ) self . fcfld_1 = ( None , None ) self . fcfld_2 = ( None , None ) def initializeParameters ( self ) : """Refine the properties of a tool's parameters. This method is called when the tool is opened.""" return def updateParameters ( self ) : """Modify the values and properties of parameters before internal validation is performed. This method is called whenever a parameter has been changed.""" if self . params [ 0 ] . value and self . params [ 1 ] . value and self . params [ 2 ] . value and self . params [ 3 ] . value : # get second field and value list fc , c_2 = str ( self . params [ 0 ] . value ) , str ( self . params [ 3 ] . value ) if self . fcfld_2 != ( fc , c_2 ) : self . fcfld_2 = ( fc , c_2 ) wc = "{} = {}" . format ( self . params [ 1 ] . value , str ( self . params [ 2 ] . value ) ) # where clause does not check field type self . params [ 4 ] . filter . list = [ str ( val ) for val in sorted ( set ( row . getValue ( c_2 ) for row in arcpy . SearchCursor ( fc , fields = c_2 , where_clause = wc ) ) ) ] if self . params [ 4 ] . value not in self . params [ 4 ] . filter . list : self . params [ 4 ] . value = self . params [ 4 ] . filter . list [ 0 ] elif self . params [ 0 ] . value and self . params [ 1 ] . value : # get first field and value list fc , c_1 = str ( self . params [ 0 ] . value ) , str ( self . params [ 1 ] . value ) if self . fcfld_1 != ( fc , c_1 ) : self . fcfld_1 = ( fc , c_1 ) self . params [ 2 ] . filter . list = [ str ( val ) for val in sorted ( set ( row . getValue ( c_1 ) for row in arcpy . SearchCursor ( fc , fields = c_1 ) ) ) ] if self . params [ 2 ] . value not in self . params [ 2 ] . filter . list : self . params [ 2 ] . value = self . params [ 2 ] . filter . list [ 0 ] return def updateMessages ( self ) : """Modify the messages created by internal validation for each tool parameter. This method is called after internal validation.""" return Hope this helps.

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Conditional Drop Down Lists - Tool Validator

AmandaMacDonald-Creevey

I'm trying to use the ToolValidator function to update the content of the drop down lists. I've followed the steps from https://blogs.esri.com/esri/arcgis/2011/08/25/generating-a-choice-list-from-a-field/ but need to take it a step further and populate the 'HA' drop down list with the values in the 'HarvestArea' field that start with the 'ForestID'.

Any help on how to format this in the ToolValidator script (see below) would be much appreciated!

<SPAN class="keyword token">import</SPAN> arcpy
<SPAN class="keyword token">class</SPAN> <SPAN class="token class-name">ToolValidator</SPAN><SPAN class="punctuation token">(</SPAN>object<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp; <SPAN class="string token">"""Class for validating a tool's parameter values and controlling
&nbsp; the behavior of the tool's dialog."""</SPAN>

&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">__init__</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"""Setup arcpy and the list of tool parameters."""</SPAN>
&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetParameterInfo<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>fcfield <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN>None<SPAN class="punctuation token">,</SPAN> None<SPAN class="punctuation token">)</SPAN>

&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">initializeParameters</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"""Refine the properties of a tool's parameters.&nbsp; This method is
&nbsp;&nbsp;&nbsp; called when the tool is opened."""</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN>

&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">updateParameters</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"""Modify the values and properties of parameters before internal
&nbsp;&nbsp;&nbsp; validation is performed.&nbsp; This method is called whenever a parmater
&nbsp;&nbsp;&nbsp; has been changed."""</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">and</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; fc<SPAN class="punctuation token">,</SPAN> col <SPAN class="operator token">=</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>fcfield <SPAN class="operator token">!=</SPAN> <SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN> col<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>fcfield <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN> col<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN>str<SPAN class="punctuation token">(</SPAN>val<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> val <SPAN class="keyword token">in</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; sorted<SPAN class="punctuation token">(</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; set<SPAN class="punctuation token">(</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; row<SPAN class="punctuation token">.</SPAN>getValue<SPAN class="punctuation token">(</SPAN>col<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">for</SPAN> row <SPAN class="keyword token">in</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; fields<SPAN class="operator token">=</SPAN>col<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">not</SPAN> <SPAN class="keyword token">in</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">=</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN>

&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">updateMessages</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"""Modify the messages created by internal validation for each tool
&nbsp;&nbsp;&nbsp; parameter.&nbsp; This method is called after internal validation."""</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN>
<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

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Accepted answers

RandyBurton

I looked at the blog post mentioned in your post. I believe you need to add an additional parameter for the name of the second field. The following code gives you an idea of what to add/modify in the validator section. Once you have the value of the first field, it will be used in a where clause to filter the results of the second field selection. Note that the code does not check for field types, so the where clause may not be properly formed.

Dual Value List

<SPAN class="keyword token">import</SPAN> arcpy
<SPAN class="keyword token">class</SPAN> <SPAN class="token class-name">ToolValidator</SPAN><SPAN class="punctuation token">(</SPAN>object<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp; <SPAN class="string token">"""Class for validating a tool's parameter values and controlling
&nbsp; the behavior of the tool's dialog."""</SPAN>

&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">__init__</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"""Setup arcpy and the list of tool parameters."""</SPAN>
&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetParameterInfo<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>fcfld_1 <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN>None<SPAN class="punctuation token">,</SPAN> None<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>fcfld_2 <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN>None<SPAN class="punctuation token">,</SPAN> None<SPAN class="punctuation token">)</SPAN>

&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">initializeParameters</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"""Refine the properties of a tool's parameters.&nbsp; This method is
&nbsp;&nbsp;&nbsp; called when the tool is opened."""</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN>

&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">updateParameters</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"""Modify the values and properties of parameters before internal
&nbsp;&nbsp;&nbsp; validation is performed.&nbsp; This method is called whenever a parameter
&nbsp;&nbsp;&nbsp; has been changed."""</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">and</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">and</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">and</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">:</SPAN> <SPAN class="comment token"># get second field and value list</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; fc<SPAN class="punctuation token">,</SPAN> c_2 <SPAN class="operator token">=</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>fcfld_2 <SPAN class="operator token">!=</SPAN> <SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN> c_2<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>fcfld_2 <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN> c_2<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; wc <SPAN class="operator token">=</SPAN> <SPAN class="string token">"{} = {}"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">,</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># where clause does not check field type</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">4</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN>str<SPAN class="punctuation token">(</SPAN>val<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> val <SPAN class="keyword token">in</SPAN> sorted<SPAN class="punctuation token">(</SPAN>set<SPAN class="punctuation token">(</SPAN>row<SPAN class="punctuation token">.</SPAN>getValue<SPAN class="punctuation token">(</SPAN>c_2<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> row <SPAN class="keyword token">in</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN>fields<SPAN class="operator token">=</SPAN>c_2<SPAN class="punctuation token">,</SPAN> where_clause<SPAN class="operator token">=</SPAN>wc<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">4</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">not</SPAN> <SPAN class="keyword token">in</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">4</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">4</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">=</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">4</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">elif</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">and</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">:</SPAN> <SPAN class="comment token"># get first field and value list</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; fc<SPAN class="punctuation token">,</SPAN> c_1 <SPAN class="operator token">=</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>fcfld_1 <SPAN class="operator token">!=</SPAN> <SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN> c_1<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>fcfld_1 <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN> c_1<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN>str<SPAN class="punctuation token">(</SPAN>val<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> val <SPAN class="keyword token">in</SPAN> sorted<SPAN class="punctuation token">(</SPAN>set<SPAN class="punctuation token">(</SPAN>row<SPAN class="punctuation token">.</SPAN>getValue<SPAN class="punctuation token">(</SPAN>c_1<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> row <SPAN class="keyword token">in</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN>fields<SPAN class="operator token">=</SPAN>c_1<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">not</SPAN> <SPAN class="keyword token">in</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">=</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN>

&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">updateMessages</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"""Modify the messages created by internal validation for each tool
&nbsp;&nbsp;&nbsp; parameter.&nbsp; This method is called after internal validation."""</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

Hope this helps.

All comments

RobertKnapik

I would like my tool to work like yours but with different data. I made a scripting tool in ArcGIS Pro and it works. Now I would like to embed the tool in a web application using geoprocessing widget. I found out that this is not possible because script validation doesn't work in geoprocessin widget. Look at this: How to Implement Custom tool Validation for Geoprocessing Widget. I this case, probably the only solution is to create a custom widget using java script.

RandyBurton

I haven't worked with Portal, so I'm not sure how it would work as a web tool. I suggest that you post a new question and include a link to this one for reference. Can you provide a bit more about what you want your tool to do?

RobertKnapik

Your code is very useful. Is it possible to publish this script tool as a web tool (in Portal for ArcGIS) and use it in geoprocessing widget in Web AppBuilder? I tried but only one value appears on the lists. Maybe I make a mistake somewhere...

Thanks,

Robert

MichaelMichaelides

Mr Burton i didn't know how else to contact you regarding a similar issue that i have. I have posted my issue in the following url: https://community.esri.com/thread/213736-select-by-many-attributes-and-then-zoom-to-selected .

I tried searching to find a solution but until today i haven't found or given a solution that actually works. If you could find the time and take a look at my request i would appreciate it.

I already tried to alter the Tool validator with my columns based on the solution provided in your answer and added the new script tool (without changing anything) also from your answer within the current toolbox that i had but didn't work.

Please i need your guidance.

Regards

Mike

AmandaMacDonald-Creevey

This was just what I was after - I've finally finished the tool that I was trying to create. Thanks so much for your help, much appreciated!

RandyBurton

I modified the code to do some error checking (basically to make sure the fields exist in the selected feature and to adjust for fields of either type string or number). I also added some messages in the updateMessages code.

For the ToolValidator section:

<SPAN class="keyword token">class</SPAN> <SPAN class="token class-name">ToolValidator</SPAN><SPAN class="punctuation token">(</SPAN>object<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">__init__</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">import</SPAN> arcpy
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetParameterInfo<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">initializeParameters</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># (initializeParameters code here)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">updateParameters</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">:</SPAN> <SPAN class="comment token"># feature has been selected</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; useFields <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN>u<SPAN class="string token">'Forest'</SPAN><SPAN class="punctuation token">,</SPAN> u<SPAN class="string token">'HarvestArea'</SPAN><SPAN class="punctuation token">,</SPAN> u<SPAN class="string token">'Setting'</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="comment token"># names of fields used by tool</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; desc <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>Describe<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># information about input feature</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; fieldNames <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">{</SPAN> f<SPAN class="punctuation token">.</SPAN>name<SPAN class="punctuation token">:</SPAN> f<SPAN class="punctuation token">.</SPAN>type <SPAN class="keyword token">for</SPAN> f <SPAN class="keyword token">in</SPAN> desc<SPAN class="punctuation token">.</SPAN>fields <SPAN class="punctuation token">}</SPAN> <SPAN class="comment token"># dictionary used to keep field names and types together</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> set<SPAN class="punctuation token">(</SPAN>useFields<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN>issubset<SPAN class="punctuation token">(</SPAN>fieldNames<SPAN class="punctuation token">.</SPAN>keys<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">:</SPAN> <SPAN class="comment token"># all fields found in input feature</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; fc<SPAN class="punctuation token">,</SPAN> c_1 <SPAN class="operator token">=</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Forest'</SPAN> <SPAN class="comment token"># Check field 'Forest'</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN>str<SPAN class="punctuation token">(</SPAN>val<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> val <SPAN class="keyword token">in</SPAN> sorted<SPAN class="punctuation token">(</SPAN>set<SPAN class="punctuation token">(</SPAN>row<SPAN class="punctuation token">.</SPAN>getValue<SPAN class="punctuation token">(</SPAN>c_1<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> row <SPAN class="keyword token">in</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN>fields<SPAN class="operator token">=</SPAN>c_1<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">not</SPAN> <SPAN class="keyword token">in</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">=</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; fc<SPAN class="punctuation token">,</SPAN> c_2 <SPAN class="operator token">=</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'HarvestArea'</SPAN> <SPAN class="comment token"># Check field 'HarvestArea'</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> fieldNames<SPAN class="punctuation token">[</SPAN><SPAN class="string token">'Forest'</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">==</SPAN> u<SPAN class="string token">'String'</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; wc2 <SPAN class="operator token">=</SPAN> <SPAN class="string token">"Forest = '{}'"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># field is string type</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">else</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; wc2 <SPAN class="operator token">=</SPAN> <SPAN class="string token">"Forest = {}"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># field assumed to be a number field</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN>str<SPAN class="punctuation token">(</SPAN>val<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> val <SPAN class="keyword token">in</SPAN> sorted<SPAN class="punctuation token">(</SPAN>set<SPAN class="punctuation token">(</SPAN>row<SPAN class="punctuation token">.</SPAN>getValue<SPAN class="punctuation token">(</SPAN>c_2<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> row <SPAN class="keyword token">in</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN>fields<SPAN class="operator token">=</SPAN>c_2<SPAN class="punctuation token">,</SPAN>where_clause<SPAN class="operator token">=</SPAN>wc2<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">not</SPAN> <SPAN class="keyword token">in</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">=</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; fc<SPAN class="punctuation token">,</SPAN> c_3 <SPAN class="operator token">=</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Setting'</SPAN> <SPAN class="comment token"># Check field 'Setting'</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> fieldNames<SPAN class="punctuation token">[</SPAN><SPAN class="string token">'HarvestArea'</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">==</SPAN> u<SPAN class="string token">'String'</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; wc3 <SPAN class="operator token">=</SPAN> <SPAN class="string token">"{} AND HarvestArea = '{}'"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>wc2<SPAN class="punctuation token">,</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># field is string type</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">else</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; wc3 <SPAN class="operator token">=</SPAN> <SPAN class="string token">"{} AND HarvestArea = {}"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>wc2<SPAN class="punctuation token">,</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># field assumed to be a number field</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN>str<SPAN class="punctuation token">(</SPAN>val<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> val <SPAN class="keyword token">in</SPAN> sorted<SPAN class="punctuation token">(</SPAN>set<SPAN class="punctuation token">(</SPAN>row<SPAN class="punctuation token">.</SPAN>getValue<SPAN class="punctuation token">(</SPAN>c_3<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> row <SPAN class="keyword token">in</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN>fields<SPAN class="operator token">=</SPAN>c_3<SPAN class="punctuation token">,</SPAN>where_clause<SPAN class="operator token">=</SPAN>wc3<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">not</SPAN> <SPAN class="keyword token">in</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">=</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># output set to completed whereClause</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> fieldNames<SPAN class="punctuation token">[</SPAN><SPAN class="string token">'Setting'</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">==</SPAN> u<SPAN class="string token">'String'</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">4</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">=</SPAN> <SPAN class="string token">"{} AND Setting = '{}'"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>wc3<SPAN class="punctuation token">,</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># field is string type</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">else</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">4</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">=</SPAN> <SPAN class="string token">"{} AND Setting = {}"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>wc3<SPAN class="punctuation token">,</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># field assumed to be a number field</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">else</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="comment token"># at least one of the field names does not exist in feature; using the parameter to hold an error message</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> u<SPAN class="string token">'Forest'</SPAN> <SPAN class="operator token">not</SPAN> <SPAN class="keyword token">in</SPAN> fieldNames<SPAN class="punctuation token">.</SPAN>keys<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">=</SPAN> <SPAN class="string token">"ERROR: Field 'Forest' not in selected feature class."</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> u<SPAN class="string token">'HarvestArea'</SPAN> <SPAN class="operator token">not</SPAN> <SPAN class="keyword token">in</SPAN> fieldNames<SPAN class="punctuation token">.</SPAN>keys<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">=</SPAN> <SPAN class="string token">"ERROR: Field 'HarvestArea' not in selected feature class."</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> u<SPAN class="string token">'Setting'</SPAN> <SPAN class="operator token">not</SPAN> <SPAN class="keyword token">in</SPAN> fieldNames<SPAN class="punctuation token">.</SPAN>keys<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">=</SPAN> <SPAN class="string token">"ERROR: Field 'Setting' not in selected feature class."</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">updateMessages</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>clearMessage<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>clearMessage<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>clearMessage<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>clearMessage<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="keyword token">is</SPAN> <SPAN class="operator token">not</SPAN> None<SPAN class="punctuation token">:</SPAN> <SPAN class="comment token"># set error message if field not in feature so user can correct problem</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="keyword token">is</SPAN> <SPAN class="operator token">not</SPAN> None<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">.</SPAN>startswith<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"ERROR:"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># self.params[3].value = None # clear error message in parameter value, if desired</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>setErrorMessage<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"Input FC '{}' does not contain field '{}'"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Setting'</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>setErrorMessage<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"Field '{}' is not in Input FC '{}'"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN><SPAN class="string token">'Setting'</SPAN><SPAN class="punctuation token">,</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="keyword token">is</SPAN> <SPAN class="operator token">not</SPAN> None<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">.</SPAN>startswith<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"ERROR:"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># self.params[2].value = None # clear error message in parameter value, if desired</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>setErrorMessage<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"Input FC '{}' does not contain field '{}'"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'HarvestArea'</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>setErrorMessage<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"Field '{}' is not in Input FC '{}'"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN><SPAN class="string token">'HarvestArea'</SPAN><SPAN class="punctuation token">,</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="keyword token">is</SPAN> <SPAN class="operator token">not</SPAN> None<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">.</SPAN>startswith<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"ERROR:"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># self.params[1].value = None # clear error message in parameter value, if desired</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>setErrorMessage<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"Input FC '{}' does not contain field '{}'"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Forest'</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>setErrorMessage<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"Field '{}' is not in Input FC '{}'"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN><SPAN class="string token">'Forest'</SPAN><SPAN class="punctuation token">,</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN>
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

For the script tool, I used the following:

<SPAN class="keyword token">import</SPAN> arcpy

inFC <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetParameterAsText<SPAN class="punctuation token">(</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># input feature class (Input, Data Type 'Feature Layer')</SPAN>
forestVal <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetParameterAsText<SPAN class="punctuation token">(</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># selected value of Forest field (Input, Data Type 'String')</SPAN>
harvestVal <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetParameterAsText<SPAN class="punctuation token">(</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># selected value of HarvestArea field (Input, Data Type 'String')</SPAN>
settingVal <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetParameterAsText<SPAN class="punctuation token">(</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># selected value of Setting field (Input, Data Type 'String')</SPAN>
whereClause <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetParameterAsText<SPAN class="punctuation token">(</SPAN><SPAN class="number token">4</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># set by ToolValidator updateParameters (Output, Derived, Data Type 'String')</SPAN>

arcpy<SPAN class="punctuation token">.</SPAN>AddMessage<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"Where clause used: {}"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>whereClause<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> 
arcpy<SPAN class="punctuation token">.</SPAN>SelectLayerByAttribute_management<SPAN class="punctuation token">(</SPAN>inFC<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"NEW_SELECTION"</SPAN><SPAN class="punctuation token">,</SPAN> where_clause<SPAN class="operator token">=</SPAN>whereClause<SPAN class="punctuation token">)</SPAN>

n <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetCount_management<SPAN class="punctuation token">(</SPAN>inFC<SPAN class="punctuation token">)</SPAN>
arcpy<SPAN class="punctuation token">.</SPAN>AddMessage<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"Number of records selected: {}"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>n<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>‍‍‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

RandyBurton

As Debugging a ToolValidator class suggests, I placed the ToolValidator in a script that could be run inside an IDE where I could use print statements for testing purposes. There may be additional checks you will want to add to the code, such as a test that the 3 fields you are checking exist in the feature. I used the following code:

<SPAN class="comment token"><SPAN># HELP at </SPAN><A class="jive-link-external-small" href="https://community.esri.com/external-link.jspa?url=http%3A%2F%2Fdesktop.arcgis.com%2Fen%2Farcmap%2Flatest%2Fanalyze%2Fcreating-tools%2Fdebugging-a-toolvalidator-class.htm" target="_blank">http://desktop.arcgis.com/en/arcmap/latest/analyze/creating-tools/debugging-a-toolvalidator-class.htm</A></SPAN>

<SPAN class="keyword token">import</SPAN> arcpy

<SPAN class="comment token"># Load the toolbox and get the tool's parameters, using the tool</SPAN>
<SPAN class="comment token">#&nbsp; name (not the tool label).</SPAN>
<SPAN class="comment token">#</SPAN>
arcpy<SPAN class="punctuation token">.</SPAN>ImportToolbox<SPAN class="punctuation token">(</SPAN>r<SPAN class="string token">"C:\Path\To\Toolbox.tbx"</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># toolbox location</SPAN>
params <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetParameterInfo<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"SelectAttributes"</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># name of script (not tool label)</SPAN>

<SPAN class="comment token"># Set required parameters</SPAN>
<SPAN class="comment token">#</SPAN>
params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">=</SPAN> r<SPAN class="string token">"C:\Path\To\geodatabase.gdb\Settings"</SPAN> <SPAN class="comment token"># feature layer</SPAN>

<SPAN class="comment token"># ToolValidator class block</SPAN>
<SPAN class="comment token"># ----------------------------------------------------------------</SPAN>
<SPAN class="keyword token">class</SPAN> <SPAN class="token class-name">ToolValidator</SPAN><SPAN class="punctuation token">(</SPAN>object<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">__init__</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">import</SPAN> arcpy
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetParameterInfo<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">initializeParameters</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># (initializeParameters code here)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">updateParameters</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">:</SPAN> <SPAN class="comment token"># feature has been selected</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># may want to insert some code to insure that selected feature has fields 'Forest', 'HarvestArea' and 'Setting'</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; fc<SPAN class="punctuation token">,</SPAN> c_1 <SPAN class="operator token">=</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Forest'</SPAN> <SPAN class="comment token"># Check field 'Forest'</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN>str<SPAN class="punctuation token">(</SPAN>val<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> val <SPAN class="keyword token">in</SPAN> sorted<SPAN class="punctuation token">(</SPAN>set<SPAN class="punctuation token">(</SPAN>row<SPAN class="punctuation token">.</SPAN>getValue<SPAN class="punctuation token">(</SPAN>c_1<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> row <SPAN class="keyword token">in</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN>fields<SPAN class="operator token">=</SPAN>c_1<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">not</SPAN> <SPAN class="keyword token">in</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">=</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="comment token">### Debug ###</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN> len<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">)</SPAN> <SPAN class="comment token">### Debug ###</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; fc<SPAN class="punctuation token">,</SPAN> c_2 <SPAN class="operator token">=</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'HarvestArea'</SPAN> <SPAN class="comment token"># Check field 'HarvestArea'</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; wc2 <SPAN class="operator token">=</SPAN> <SPAN class="string token">"Forest = '{}'"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># where assumes string values for fields</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN>str<SPAN class="punctuation token">(</SPAN>val<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> val <SPAN class="keyword token">in</SPAN> sorted<SPAN class="punctuation token">(</SPAN>set<SPAN class="punctuation token">(</SPAN>row<SPAN class="punctuation token">.</SPAN>getValue<SPAN class="punctuation token">(</SPAN>c_2<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> row <SPAN class="keyword token">in</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN>fields<SPAN class="operator token">=</SPAN>c_2<SPAN class="punctuation token">,</SPAN>where_clause<SPAN class="operator token">=</SPAN>wc2<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">not</SPAN> <SPAN class="keyword token">in</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">=</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="comment token">### Debug ###</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN> len<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">)</SPAN> <SPAN class="comment token">### Debug ###</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; fc<SPAN class="punctuation token">,</SPAN> c_3 <SPAN class="operator token">=</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Setting'</SPAN> <SPAN class="comment token"># Check field 'Setting'</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; wc3 <SPAN class="operator token">=</SPAN> <SPAN class="string token">"Forest = '{}' AND HarvestArea = '{}'"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># where assumes string values for fields</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN>str<SPAN class="punctuation token">(</SPAN>val<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> val <SPAN class="keyword token">in</SPAN> sorted<SPAN class="punctuation token">(</SPAN>set<SPAN class="punctuation token">(</SPAN>row<SPAN class="punctuation token">.</SPAN>getValue<SPAN class="punctuation token">(</SPAN>c_3<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> row <SPAN class="keyword token">in</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN>fields<SPAN class="operator token">=</SPAN>c_3<SPAN class="punctuation token">,</SPAN>where_clause<SPAN class="operator token">=</SPAN>wc3<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">not</SPAN> <SPAN class="keyword token">in</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">=</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="comment token">### Debug ###</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN> len<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">)</SPAN> <SPAN class="comment token">### Debug ###</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">updateMessages</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># (updateMessages code here)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN>
<SPAN class="comment token"># ----------------------------------------------------------------</SPAN>
<SPAN class="comment token"># Call routine(s) to debug</SPAN>
<SPAN class="comment token">#</SPAN>
validator <SPAN class="operator token">=</SPAN> ToolValidator<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
validator<SPAN class="punctuation token">.</SPAN>updateParameters<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
validator<SPAN class="punctuation token">.</SPAN>updateMessages<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

Once the code tested without errors I pasted it (lines 17 to 59 minus the print lines 36, 37, 44, 45, 52 and 53) into the validation section of the script tool. As my testing environment may be a bit different from yours, my script tool code used was:

<SPAN class="keyword token">import</SPAN> arcpy

inFC <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetParameterAsText<SPAN class="punctuation token">(</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># input feature class (Data Type 'Feature Layer')</SPAN>
forestVal <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetParameterAsText<SPAN class="punctuation token">(</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># selected value of Forest field (Data Type 'String')</SPAN>
harvestVal <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetParameterAsText<SPAN class="punctuation token">(</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># selected value of HarvestArea field (Data Type 'String')</SPAN>
settingVal <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetParameterAsText<SPAN class="punctuation token">(</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># selected value of Setting field (Data Type 'String')</SPAN>

forestFld <SPAN class="operator token">=</SPAN> <SPAN class="string token">"Forest"</SPAN>
harvestFld <SPAN class="operator token">=</SPAN> <SPAN class="string token">"HarvestArea"</SPAN>
settingFld <SPAN class="operator token">=</SPAN> <SPAN class="string token">"Setting"</SPAN>

whereClause <SPAN class="operator token">=</SPAN> <SPAN class="string token">"{} = '{}' AND {} = '{}' AND {} = '{}'"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>forestFld<SPAN class="punctuation token">,</SPAN>forestVal<SPAN class="punctuation token">,</SPAN>harvestFld<SPAN class="punctuation token">,</SPAN>harvestVal<SPAN class="punctuation token">,</SPAN>settingFld<SPAN class="punctuation token">,</SPAN>settingVal<SPAN class="punctuation token">)</SPAN>
 
arcpy<SPAN class="punctuation token">.</SPAN>SelectLayerByAttribute_management<SPAN class="punctuation token">(</SPAN>inFC<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"NEW_SELECTION"</SPAN><SPAN class="punctuation token">,</SPAN> where_clause<SPAN class="operator token">=</SPAN>whereClause<SPAN class="punctuation token">)</SPAN>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

Note in the where clauses, since we are using text values, the format used was:

WHERE Field = 'some text'

You my need to adjust this for your SQL version and/or to escape certain characters.

Hope this helps and best of luck with your project.

AmandaMacDonald-Creevey

All of the fields (Forest, HarvestArea and Setting) are text fields. The input feature class will be the same every time, so yes same field names and field types.

Aim is for the end user to select the forest (i.e. 403), they will then get the list of harvest areas within the 403 forest, then once a harvest area is selected (i.e. 403-048-03) then they can select a setting from the next list (i.e. 1, 2 or 3).

Hope that answers your questions.

RandyBurton

The error message is suggesting that the string "203-001-01" is trying to be converted to an integer. Perhaps the tool's parameter has the wrong data type selection or perhaps the where clause in the validation section is changing it.

I haven't had a chance to examine your validation code yet. But I do have a some questions so that I may understand what you are wanting to accomplish.

It looks like you are trying to select rows from the feature class where Forest, HarvestArea and Setting contain specific values. Are these fields all text fields, or are some integer or other data types? Do all input feature classes contain these three fields (ie. they are always the same field names and data types)? Can you share a few rows of sample data from your feature?

AmandaMacDonald-Creevey

Hi again (Randy Burton), I'm trying to cascade these filter lists another step but I think I'm getting caught up on the where clause (python beginner here!)? I want to use the result from the second filter list (Harvest Area) to then determine the results of the third filter list (Setting).

<SPAN class="keyword token">import</SPAN> arcpy
<SPAN class="keyword token">class</SPAN> <SPAN class="token class-name">ToolValidator</SPAN><SPAN class="punctuation token">(</SPAN>object<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp; <SPAN class="string token">"""Class for validating a tool's parameter values and controlling the behavior of the tool's dialog."""</SPAN>

&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">__init__</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"""Setup arcpy and the list of tool parameters."""</SPAN>
&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetParameterInfo<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>fcfld_1 <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN>None<SPAN class="punctuation token">,</SPAN> None<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>fcfld_2 <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN>None<SPAN class="punctuation token">,</SPAN> None<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>fcfld_3 <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN>None<SPAN class="punctuation token">,</SPAN> None<SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN>

&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">initializeParameters</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"""Refine the properties of a tool's parameters.&nbsp; This method is
&nbsp;&nbsp;&nbsp; called when the tool is opened."""</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN>

&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">updateParameters</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"""Modify the values and properties of parameters before internal
&nbsp;&nbsp;&nbsp; validation is performed.&nbsp; This method is called whenever a parameter
&nbsp;&nbsp;&nbsp; has been changed."""</SPAN>

&nbsp;&nbsp;&nbsp; forestfld <SPAN class="operator token">=</SPAN> <SPAN class="string token">"Forest"</SPAN>
&nbsp;&nbsp;&nbsp; hafld <SPAN class="operator token">=</SPAN> <SPAN class="string token">"HarvestArea"</SPAN>
&nbsp;&nbsp;&nbsp; settingfld <SPAN class="operator token">=</SPAN> <SPAN class="string token">"Setting"</SPAN>
&nbsp;&nbsp;&nbsp; 
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">and</SPAN> forestfld <SPAN class="operator token">and</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">and</SPAN> hafld <SPAN class="operator token">and</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">and</SPAN> settingfld<SPAN class="punctuation token">:</SPAN> <SPAN class="comment token"># get settings</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; fc2<SPAN class="punctuation token">,</SPAN> c_3 <SPAN class="operator token">=</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> str<SPAN class="punctuation token">(</SPAN>settingfld<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>fcfld_3 <SPAN class="operator token">!=</SPAN><SPAN class="punctuation token">(</SPAN>fc2<SPAN class="punctuation token">,</SPAN> c_3<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>fcfld_3 <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN>fc2<SPAN class="punctuation token">,</SPAN> c_3<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; wc1 <SPAN class="operator token">=</SPAN> <SPAN class="string token">"{} = {}"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>str<SPAN class="punctuation token">(</SPAN>hafld<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN>str<SPAN class="punctuation token">(</SPAN>val<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> val <SPAN class="keyword token">in</SPAN> sorted<SPAN class="punctuation token">(</SPAN>set<SPAN class="punctuation token">(</SPAN>row<SPAN class="punctuation token">.</SPAN>getValue<SPAN class="punctuation token">(</SPAN>c_3<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> row <SPAN class="keyword token">in</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>fc2<SPAN class="punctuation token">,</SPAN>fields<SPAN class="operator token">=</SPAN>c_3<SPAN class="punctuation token">,</SPAN> where_clause<SPAN class="operator token">=</SPAN>wc1<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">not</SPAN> <SPAN class="keyword token">in</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">=</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">and</SPAN> forestfld <SPAN class="operator token">and</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">and</SPAN> hafld<SPAN class="punctuation token">:</SPAN> <SPAN class="comment token"># get harvest area</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; fc1<SPAN class="punctuation token">,</SPAN> c_2 <SPAN class="operator token">=</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> str<SPAN class="punctuation token">(</SPAN>hafld<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>fcfld_2 <SPAN class="operator token">!=</SPAN><SPAN class="punctuation token">(</SPAN>fc1<SPAN class="punctuation token">,</SPAN> c_2<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>fcfld_2 <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN>fc1<SPAN class="punctuation token">,</SPAN> c_2<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; wc <SPAN class="operator token">=</SPAN> <SPAN class="string token">"{} = {}"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>str<SPAN class="punctuation token">(</SPAN>forestfld<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN>str<SPAN class="punctuation token">(</SPAN>val<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> val <SPAN class="keyword token">in</SPAN> sorted<SPAN class="punctuation token">(</SPAN>set<SPAN class="punctuation token">(</SPAN>row<SPAN class="punctuation token">.</SPAN>getValue<SPAN class="punctuation token">(</SPAN>c_2<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> row <SPAN class="keyword token">in</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>fc1<SPAN class="punctuation token">,</SPAN>fields<SPAN class="operator token">=</SPAN>c_2<SPAN class="punctuation token">,</SPAN> where_clause<SPAN class="operator token">=</SPAN>wc<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">not</SPAN> <SPAN class="keyword token">in</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">=</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">and</SPAN> forestfld<SPAN class="punctuation token">:</SPAN> <SPAN class="comment token"># get forest</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; fc<SPAN class="punctuation token">,</SPAN> c_1 <SPAN class="operator token">=</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> str<SPAN class="punctuation token">(</SPAN>forestfld<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>fcfld_1 <SPAN class="operator token">!=</SPAN><SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN> c_1<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>fcfld_1 <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN> c_1<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN>str<SPAN class="punctuation token">(</SPAN>val<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> val <SPAN class="keyword token">in</SPAN> sorted<SPAN class="punctuation token">(</SPAN>set<SPAN class="punctuation token">(</SPAN>row<SPAN class="punctuation token">.</SPAN>getValue<SPAN class="punctuation token">(</SPAN>c_1<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> row <SPAN class="keyword token">in</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN>fields<SPAN class="operator token">=</SPAN>c_1<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">not</SPAN> <SPAN class="keyword token">in</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">=</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp; 
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN>

&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">updateMessages</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"""Modify the messages created by internal validation for each tool
&nbsp;&nbsp;&nbsp; parameter.&nbsp; This method is called after internal validation."""</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN>
<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

I'm also getting this error (see attached) where the format of the Harvest Area is 485-384-09.

Any help would be much appreciated!

AmandaMacDonald-Creevey

Perfect that's exactly what I was trying to do - thanks so much!

RandyBurton

Dual Value List

<SPAN class="keyword token">import</SPAN> arcpy
<SPAN class="keyword token">class</SPAN> <SPAN class="token class-name">ToolValidator</SPAN><SPAN class="punctuation token">(</SPAN>object<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp; <SPAN class="string token">"""Class for validating a tool's parameter values and controlling
&nbsp; the behavior of the tool's dialog."""</SPAN>

&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">__init__</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"""Setup arcpy and the list of tool parameters."""</SPAN>
&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetParameterInfo<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>fcfld_1 <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN>None<SPAN class="punctuation token">,</SPAN> None<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>fcfld_2 <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN>None<SPAN class="punctuation token">,</SPAN> None<SPAN class="punctuation token">)</SPAN>

&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">initializeParameters</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"""Refine the properties of a tool's parameters.&nbsp; This method is
&nbsp;&nbsp;&nbsp; called when the tool is opened."""</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN>

&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">updateParameters</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"""Modify the values and properties of parameters before internal
&nbsp;&nbsp;&nbsp; validation is performed.&nbsp; This method is called whenever a parameter
&nbsp;&nbsp;&nbsp; has been changed."""</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">and</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">and</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">and</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">:</SPAN> <SPAN class="comment token"># get second field and value list</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; fc<SPAN class="punctuation token">,</SPAN> c_2 <SPAN class="operator token">=</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>fcfld_2 <SPAN class="operator token">!=</SPAN> <SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN> c_2<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>fcfld_2 <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN> c_2<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; wc <SPAN class="operator token">=</SPAN> <SPAN class="string token">"{} = {}"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">,</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="comment token"># where clause does not check field type</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">4</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN>str<SPAN class="punctuation token">(</SPAN>val<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> val <SPAN class="keyword token">in</SPAN> sorted<SPAN class="punctuation token">(</SPAN>set<SPAN class="punctuation token">(</SPAN>row<SPAN class="punctuation token">.</SPAN>getValue<SPAN class="punctuation token">(</SPAN>c_2<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> row <SPAN class="keyword token">in</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN>fields<SPAN class="operator token">=</SPAN>c_2<SPAN class="punctuation token">,</SPAN> where_clause<SPAN class="operator token">=</SPAN>wc<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">4</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">not</SPAN> <SPAN class="keyword token">in</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">4</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">4</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">=</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">4</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">elif</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">and</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">:</SPAN> <SPAN class="comment token"># get first field and value list</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; fc<SPAN class="punctuation token">,</SPAN> c_1 <SPAN class="operator token">=</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> str<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>fcfld_1 <SPAN class="operator token">!=</SPAN> <SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN> c_1<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>fcfld_1 <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN> c_1<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN>str<SPAN class="punctuation token">(</SPAN>val<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> val <SPAN class="keyword token">in</SPAN> sorted<SPAN class="punctuation token">(</SPAN>set<SPAN class="punctuation token">(</SPAN>row<SPAN class="punctuation token">.</SPAN>getValue<SPAN class="punctuation token">(</SPAN>c_1<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">for</SPAN> row <SPAN class="keyword token">in</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN>fields<SPAN class="operator token">=</SPAN>c_1<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">not</SPAN> <SPAN class="keyword token">in</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>value <SPAN class="operator token">=</SPAN> self<SPAN class="punctuation token">.</SPAN>params<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>filter<SPAN class="punctuation token">.</SPAN>list<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN>

&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">updateMessages</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"""Modify the messages created by internal validation for each tool
&nbsp;&nbsp;&nbsp; parameter.&nbsp; This method is called after internal validation."""</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

Hope this helps.

RandyBurton

Xander Bakker‌ has a blog post on this topic with a good code example: Implementing cascading drop down lists in a toolbox using validation with Python.

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