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Select unique values from field using selectbyattribute

wwnde

I am a vety new to python. I have done the script below which identifies unique values and lists them. That goes ok. The next thing, I want it to iterate through the filed LinkKey as it selects similar LinkKeys and saves them in a work space.

All i get is a message saying zero records selected. I suspect the issue is in my whereclause.

Any help?

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wwnde

Hi Chris

That may not be suitable here, this script is part of a larger model. It searches a database and gives outputs to be fed in consequent processes. May not be feasible to pull out an mxd and iterate. All I need is a suitable expression that will pull out a subselection and copy features. Does that make sense?

ChrisParkin2

I'd probably use a definition query to make the initial selection, then use a search cursor on the definition query.

At least that's what I did last week.

Though I've probably misunderstood the question.

<SPAN class="comment token"># Chris Parkin, 14/3/2018</SPAN>
<SPAN class="keyword token">import</SPAN> arcpy

mxd <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>mapping<SPAN class="punctuation token">.</SPAN>MapDocument<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"CURRENT"</SPAN><SPAN class="punctuation token">)</SPAN>
df <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>mapping<SPAN class="punctuation token">.</SPAN>ListDataFrames<SPAN class="punctuation token">(</SPAN>mxd<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"Layers"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN>

<SPAN class="comment token"># This must be sorted chronologically beforehand</SPAN>
visitLayer <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>mapping<SPAN class="punctuation token">.</SPAN>ListLayers<SPAN class="punctuation token">(</SPAN>mxd<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Visits_Inspectors_XY_XY_SortedDatetime'</SPAN><SPAN class="punctuation token">,</SPAN> df<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN>

<SPAN class="comment token"># Build list of inspectors</SPAN>
inspectors <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="punctuation token">]</SPAN>
<SPAN class="keyword token">with</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>da<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>visitLayer<SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="string token">'Assigned_inspectors'</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">as</SPAN> cursor<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">for</SPAN> inspector <SPAN class="keyword token">in</SPAN> cursor<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> inspector<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">not</SPAN> <SPAN class="keyword token">in</SPAN> inspectors<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; inspectors<SPAN class="punctuation token">.</SPAN>append<SPAN class="punctuation token">(</SPAN>inspector<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN>

lastIter <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN>'<SPAN class="comment token">#','#','#','#','#','#','#','#','#','#']</SPAN>
<SPAN class="keyword token">for</SPAN> inspector <SPAN class="keyword token">in</SPAN> inspectors<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; visitLayer<SPAN class="punctuation token">.</SPAN>definitionQuery <SPAN class="operator token">=</SPAN> <SPAN class="string token">"Assigned_inspectors = '%s'"</SPAN> <SPAN class="operator token">%</SPAN> inspector
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">with</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>da<SPAN class="punctuation token">.</SPAN>UpdateCursor<SPAN class="punctuation token">(</SPAN>visitLayer<SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="string token">'last_action_date'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'X_Inspector'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Y_Inspector'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'X_Visit'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Y_Visit'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'X_Start'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Y_Start'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'X_End'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Y_End'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Day'</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">as</SPAN> cursor<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">for</SPAN> inspector <SPAN class="keyword token">in</SPAN> cursor<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> inspector<SPAN class="punctuation token">[</SPAN><SPAN class="number token">9</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">==</SPAN> lastIter<SPAN class="punctuation token">[</SPAN><SPAN class="number token">9</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"># Start</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; inspector<SPAN class="punctuation token">[</SPAN><SPAN class="number token">5</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">=</SPAN> lastIter<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</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; inspector<SPAN class="punctuation token">[</SPAN><SPAN class="number token">6</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">=</SPAN> lastIter<SPAN class="punctuation token">[</SPAN><SPAN class="number token">4</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"># End</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; inspector<SPAN class="punctuation token">[</SPAN><SPAN class="number token">7</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">=</SPAN> inspector<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</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; inspector<SPAN class="punctuation token">[</SPAN><SPAN class="number token">8</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">=</SPAN> inspector<SPAN class="punctuation token">[</SPAN><SPAN class="number token">4</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">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; <SPAN class="comment token"># Start</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; inspector<SPAN class="punctuation token">[</SPAN><SPAN class="number token">5</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">=</SPAN> inspector<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</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; inspector<SPAN class="punctuation token">[</SPAN><SPAN class="number token">6</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">=</SPAN> inspector<SPAN class="punctuation token">[</SPAN><SPAN class="number token">2</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"># End</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; inspector<SPAN class="punctuation token">[</SPAN><SPAN class="number token">7</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">=</SPAN> inspector<SPAN class="punctuation token">[</SPAN><SPAN class="number token">3</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; inspector<SPAN class="punctuation token">[</SPAN><SPAN class="number token">8</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">=</SPAN> inspector<SPAN class="punctuation token">[</SPAN><SPAN class="number token">4</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cursor<SPAN class="punctuation token">.</SPAN>updateRow<SPAN class="punctuation token">(</SPAN>inspector<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; lastIter <SPAN class="operator token">=</SPAN> inspector
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍<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>

wwnde

Though this script does what I need to do, I would be much happier if it can select within the selected features based on field CWY. CWY has five sets of attributes which could apply to any of the attributes in ROUTE_NE_ID. How can I do an exp for the below command without necessarily a definition for unique values in CWY again?

arcpy.SelectLayerByAttribute_management(road_lyr, 'SUBSET_SELECTION', exp)

DanPatterson_Retired

To simply get the unique values from a field, whether you are using cursors for other purposes or not, you can use the table/featureclass and pull out the unique values from it

<SPAN class="comment token"># --- one import</SPAN>
<SPAN class="keyword token">import</SPAN> numpy <SPAN class="keyword token">as</SPAN> np

<SPAN class="comment token"># --- you already know the table source</SPAN>
in_tbl <SPAN class="operator token">=</SPAN> <SPAN class="string token">'C:\\GIS\\A_Tools_scripts\\Numpy_arc\\Numpy_arc.gdb\\sample_1000'</SPAN>

<SPAN class="comment token"># --- ditto for the field name, use an arcpy.da function</SPAN>
arr <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>da<SPAN class="punctuation token">.</SPAN>TableToNumPyArray<SPAN class="punctuation token">(</SPAN>in_tbl<SPAN class="punctuation token">,</SPAN> field_names<SPAN class="operator token">=</SPAN><SPAN class="punctuation token">[</SPAN><SPAN class="string token">'County'</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN>

<SPAN class="comment token"># --- and a simple numpy function</SPAN>
uni <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN>i<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="keyword token">for</SPAN> i <SPAN class="keyword token">in</SPAN> np<SPAN class="punctuation token">.</SPAN>unique<SPAN class="punctuation token">(</SPAN>arr<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">]</SPAN>

<SPAN class="comment token"># --- there it is (actually, they were the unique values in the field)</SPAN>
uni
<SPAN class="punctuation token">[</SPAN><SPAN class="string token">'A'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'B'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'C'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'D'</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>

wwnde

Thanks, Randy, Dan, Joe and Chris. Very helpful insights. Didn't have time in the week to come back to it. Borrowing from your posts, it ended up well. Have come up with the below code and fed it into a model builder tool. It worked. Thanks

# Import arcpy module
#Identify unique linkkeys, select and save them for input into bulk distance network analyst model
import arcpy


# Set environmental variables

arcpy.env.overwriteOutput = True

arcpy.env.workspace =r"C:\Users\William\Desktop\mt barker\DemoInventory.gdb"
fc = 'PLOTS_Test'
field = 'LinkKey'

#def unique values in LinKey method 1 and it works
def unique(fc, field):
 values = [row[0] for row in arcpy.da.SearchCursor(fc, field)]
 uniqueValues = set(values)

 print(uniqueValues)
 
 return uniqueValues # unique should return a value 

unique_LinkKey = unique(fc, field)#as a function


print 'unique_LinkKey:'


PLOTS_Test_lyr = arcpy.MakeFeatureLayer_management("PLOTS_Test", "PLOTS_Test_lyr")#layer from the feature class

for individual in unique_LinkKey:
 whereClause = "LinkKey = '%s'" % individual
 print(whereClause)
 arcpy.SelectLayerByAttribute_management(PLOTS_Test_lyr, 'NEW_SELECTION', whereClause)
 
 
 arcpy.CopyFeatures_management(PLOTS_Test_lyr, "sasa1")#Copying features from selection
 cnt = arcpy.GetCount_management("PLOTS_Test_lyr") # Counting the selected and copied features
 print("The number of selected records is: " + str(cnt))
 arcpy.SelectLayerByAttribute_management(PLOTS_Test_lyr, "CLEAR_SELECTION")
 print("The number of selected records is: " + str(cnt))

wwnde

Joe, very useful. it worked, importantly it introduced me to the arcpy.Describe. Thanks

ChrisParkin2

I did something similar earlier in the week. essentially you need to iterate over the unique list, you don't need the 2nd cursor.

<SPAN class="keyword token">import</SPAN> arcpy
arcpy<SPAN class="punctuation token">.</SPAN>env<SPAN class="punctuation token">.</SPAN>workspace <SPAN class="operator token">=</SPAN> r<SPAN class="string token">'C:\Workarea\Temp\geonetexample.gdb'</SPAN>
<SPAN class="comment token"># Build list of unique LinkKeys</SPAN>
unique_LinkKey_List <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="punctuation token">]</SPAN>
<SPAN class="keyword token">with</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>da<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN><SPAN class="string token">'PLOTS_Test_lyr'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="string token">'LinkKey'</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">as</SPAN> cursor<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">for</SPAN> key <SPAN class="keyword token">in</SPAN> cursor<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> key<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">not</SPAN> <SPAN class="keyword token">in</SPAN> unique_LinkKey_List<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unique_LinkKey_List<SPAN class="punctuation token">.</SPAN>append<SPAN class="punctuation token">(</SPAN>key<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN>

<SPAN class="comment token"># iterate over unique keys</SPAN>
<SPAN class="keyword token">for</SPAN> key <SPAN class="keyword token">in</SPAN> unique_LinkKey_List<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; whereClause <SPAN class="operator token">=</SPAN> <SPAN class="string token">"LinkKey = '%s'"</SPAN> <SPAN class="operator token">%</SPAN> key
&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>SelectLayerByAttribute_management<SPAN class="punctuation token">(</SPAN><SPAN class="string token">'PLOTS_Test_lyr'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'NEW_SELECTION'</SPAN><SPAN class="punctuation token">,</SPAN> whereClause<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; 
&nbsp;&nbsp;&nbsp; outFC <SPAN class="operator token">=</SPAN> <SPAN class="string token">'Key_FC_%s'</SPAN> <SPAN class="operator token">%</SPAN> key
&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>CopyFeatures_management<SPAN class="punctuation token">(</SPAN><SPAN class="string token">'PLOTS_Test_lyr'</SPAN><SPAN class="punctuation token">,</SPAN> outFC<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; cnt <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetCount_management<SPAN class="punctuation token">(</SPAN><SPAN class="string token">'PLOTS_Test_lyr'</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>AddMessage<SPAN class="punctuation token">(</SPAN><SPAN class="string token">'Exported %s Records as %s'</SPAN> <SPAN class="operator token">%</SPAN> <SPAN class="punctuation token">(</SPAN>cnt<SPAN class="punctuation token">,</SPAN> outFC<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>

RandyBurton

In your code you are using a function to find a set of unique values, but the function isn't returning anything (therefore, it equals None). Add a line to "return uniqueValues".

<SPAN class="keyword token">def</SPAN> <SPAN class="token function">unique</SPAN><SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN> field<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; values <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN>row<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="keyword token">for</SPAN> row <SPAN class="keyword token">in</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>da<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN><SPAN class="punctuation token">(</SPAN>field<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp; uniqueValues <SPAN class="operator token">=</SPAN> set<SPAN class="punctuation token">(</SPAN>values<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN><SPAN class="punctuation token">(</SPAN>uniqueValues<SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN> uniqueValues&nbsp; <SPAN class="comment token"># unique should return a value</SPAN>

Vals <SPAN class="operator token">=</SPAN> unique<SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN> field<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>

Also if the goal is to count the number of records with a certain attribute, you can modify the function to return a count of the unique records and you will not need to use SelectLayerByAttribute. You would use just one Search Cursor.

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

fc <SPAN class="operator token">=</SPAN> r<SPAN class="string token">'C:\Path\To\file.gdb\feature'</SPAN>
field <SPAN class="operator token">=</SPAN> <SPAN class="string token">'FieldName'</SPAN> <SPAN class="comment token"># not an alias</SPAN>

d <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">{</SPAN><SPAN class="punctuation token">}</SPAN>

<SPAN class="keyword token">with</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>da<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">(</SPAN>field<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">as</SPAN> rows<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">for</SPAN> row <SPAN class="keyword token">in</SPAN> rows<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> row<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">not</SPAN> <SPAN class="keyword token">in</SPAN> d<SPAN class="punctuation token">:</SPAN>&nbsp; <SPAN class="comment token"># add to dictionary with value of 1</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; d<SPAN class="punctuation token">[</SPAN>row<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">=</SPAN> <SPAN class="number token">1</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">else</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="comment token"># it is in dictionary, just incrment counter</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; d<SPAN class="punctuation token">[</SPAN>row<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">+=</SPAN> <SPAN class="number token">1</SPAN>


<SPAN class="keyword token">for</SPAN> k<SPAN class="punctuation token">,</SPAN> v <SPAN class="keyword token">in</SPAN> d<SPAN class="punctuation token">.</SPAN>iteritems<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="comment token"># print results</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN> k<SPAN class="punctuation token">,</SPAN> v


<SPAN class="comment token"># ===&nbsp; same idea, but as a function</SPAN>

<SPAN class="keyword token">def</SPAN> <SPAN class="token function">unique2</SPAN><SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN> field<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; ud <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">{</SPAN><SPAN class="punctuation token">}</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">with</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>da<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">(</SPAN>field<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">as</SPAN> rows<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">for</SPAN> row <SPAN class="keyword token">in</SPAN> rows<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> row<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">not</SPAN> <SPAN class="keyword token">in</SPAN> ud<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ud<SPAN class="punctuation token">[</SPAN>row<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">=</SPAN> <SPAN class="number token">1</SPAN>
&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; ud<SPAN class="punctuation token">[</SPAN>row<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">+=</SPAN> <SPAN class="number token">1</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN> ud

Vals2 <SPAN class="operator token">=</SPAN> unique2<SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN> field<SPAN class="punctuation token">)</SPAN>

<SPAN class="keyword token">print</SPAN> <SPAN class="string token">'Vals2:'</SPAN>
<SPAN class="keyword token">for</SPAN> k<SPAN class="punctuation token">,</SPAN> v <SPAN class="keyword token">in</SPAN> Vals2<SPAN class="punctuation token">.</SPAN>iteritems<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN> k<SPAN class="punctuation token">,</SPAN> v‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍<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>

JoeBorgione

I'm just a big toddler in python, but after looking at your code, I tried a slightly different approach. I get confused with counter variables and avoid them by stepping through a list based on the length of the list:

fc = 'PLOTS_Test'
arcpy.MakeFeatureLayer_management(fc,'Test_lyr')
field_list = []
with arcpy.da.SearchCursor( fc, 'LinkKey') as cursor:
&nbsp;&nbsp;&nbsp; for row in cursor:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; field_list.append(row[0])

for i in range(len(field_list)):
&nbsp;&nbsp;&nbsp; where= 'LinkKey = {}'.format(field_list<I>)
&nbsp;&nbsp;&nbsp; arcpy.SelectLayerByAttribute_management('Test_lyr','ADD_TO_SELECTION',where)
print 'Records Selected = {}'.format(arcpy.GetCount_management('Test_lyr'))
arcpy.CopyFeatures_management('Test_lyr','sasal')‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍<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></I>

I took out kala, as I'm not sure you actually need it, and just work directly with the feature layer from the feature class.

edited moments later: sometimes the GetCount_management can throw you a curve. It honors the selection and will return the number selected, IF there is a selected set. If nothing is selected, you get the count of all the records. A way around that is using arcpy.Describe, which doesn't give you a number of selected records, but can tell you if you have selected records. I've used it this way:

<SPAN class="keyword token">if</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>Describe<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"view"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN>FIDSet <SPAN class="operator token">==</SPAN><SPAN class="string token">''</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp; <SPAN class="keyword token">pass</SPAN>
<SPAN class="keyword token">elif</SPAN> int<SPAN class="punctuation token">(</SPAN>arcpy<SPAN class="punctuation token">.</SPAN>Describe<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"view"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN>FIDSet<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">>=</SPAN> <SPAN class="number token">1</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp; <SPAN class="comment token">#do stuff here...‍‍‍‍</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

and edited a little later after that....

I took a look at get list of highlighted features within a selection and the response from Richard Fairhurst provided a little inspiration to get the number of selected records:

<SPAN class="keyword token">if</SPAN> int<SPAN class="punctuation token">(</SPAN>arcpy<SPAN class="punctuation token">.</SPAN>Describe<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"view"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN>FIDSet<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">>=</SPAN> <SPAN class="number token">1</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp; i <SPAN class="operator token">=</SPAN> <SPAN class="number token">0</SPAN>
&nbsp;&nbsp; rows <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>da<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"view"</SPAN><SPAN class="punctuation token">,</SPAN><SPAN class="string token">"*"</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp; <SPAN class="keyword token">for</SPAN> row <SPAN class="keyword token">in</SPAN> rows<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; i <SPAN class="operator token">=</SPAN> i<SPAN class="operator token">+</SPAN><SPAN class="number token">1</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
<SPAN class="keyword token">print</SPAN> <SPAN class="string token">'Rows selected = {}'</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>i<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>

DanPatterson_Retired

you build your 'where clause outside

<SPAN class="keyword token">for</SPAN> i <SPAN class="keyword token">in</SPAN> vals<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; exp <SPAN class="operator token">=</SPAN> <SPAN class="string token">"\"Facility = '{}'\""</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>i<SPAN class="punctuation token">)</SPAN>&nbsp; <SPAN class="comment token"># build your expression</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN><SPAN class="punctuation token">(</SPAN>exp<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; <SPAN class="comment token"># and substitute it in SBA</SPAN>
&nbsp;&nbsp;&nbsp; 
<SPAN class="string token">"Facility = 'Hall'"</SPAN>
<SPAN class="string token">"Facility = 'Church'"</SPAN>
<SPAN class="string token">"Facility = 'Hospital'"</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

wwnde

Thanks Dan, Thats why I did first, it worked for individual records,. I have no issue selecting an individual item in this case a specific LinkKey, the issue is when I want it to iterate and pick similar sets of duplicated 'LinkKeys'. Say if there is a dozen set of 'p' link keys and half a dozen 'j' link keys, I want it to select p, save and proceed to select j.....

DanPatterson_Retired

William... do the selectbyattributes manually, go to the Results window, and copy the python snippet.

You will get the correct syntax for the where clause. While you are doing the test, do one query for a numeric field and one for a text field and save the examples, so the next time you try to shortcut by writing the syntax out, you will have a guideline to follow

<SPAN class="comment token"># ---- SBA for text</SPAN>
arcpy<SPAN class="punctuation token">.</SPAN>management<SPAN class="punctuation token">.</SPAN>SelectLayerByAttribute<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"sample_1000"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"NEW_SELECTION"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"Facility = 'Hall'"</SPAN><SPAN class="punctuation token">,</SPAN> None<SPAN class="punctuation token">)</SPAN>

<SPAN class="comment token"># ---- SBA for numbers</SPAN>
arcpy<SPAN class="punctuation token">.</SPAN>management<SPAN class="punctuation token">.</SPAN>SelectLayerByAttribute<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"sample_1000"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"NEW_SELECTION"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"Time = 1"</SPAN><SPAN class="punctuation token">,</SPAN> None<SPAN class="punctuation token">)</SPAN>
<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

wwnde

Thanks Randy, done that but it doesnt work it returns

ERROR 000358: Invalid expression
Failed to execute (SelectLayerByAttribute).

RandyBurton

It looks like you are comparing LinkKey (or "field") to a text value instead of a number in your whereclause. Try:

<SPAN class="comment token"># omit the single quotes around the second %s</SPAN>

whereclause <SPAN class="operator token">=</SPAN> <SPAN class="string token">"%s = %s"</SPAN> <SPAN class="operator token">%</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="string token">'LinkKey'</SPAN><SPAN class="punctuation token">,</SPAN> x<SPAN class="punctuation token">)</SPAN>

<SPAN class="comment token"># optional format</SPAN>

whereclause <SPAN class="operator token">=</SPAN> <SPAN class="string token">"{} = {}"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN><SPAN class="string token">'LinkKey'</SPAN><SPAN class="punctuation token">,</SPAN> x<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>

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