I am using python in ArcPro and relearning a few things. I have a feature selected in the dataframe. I want to determine the name of that layer that has a selection and return the value of the selected object in the field called "GNIS_Name" . aprx = arcpy . mp . ArcGISProject ( "CURRENT" ) #get selected layer m = aprx . listMaps ( aprx ) refLyr = m . listLayers ( aprx ) sel_lyrs = refLyr . getSelectionSet ( aprx ) # get name of selected stream Stream_Name = arcpy . da . SearchCursor ( sel_lyrs , "GNIS_Name" , "Any value" , "" ) currently I get the error on line 5: 'list' object has no attribute 'listLayers'

aprx = arcpy . mp . ArcGISProject ( "CURRENT" ) m = aprx . activeMap lyrs = m . listLayers ( ) for lyr in lyrs : if lyr . getSelectionSet ( ) : print ( "{}: {}" . format ( lyr . name , lyr . getSelectionSet ( ) ) )

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In ArcMap Pro, how to get data from a selected layer

jasongraham

I am using python in ArcPro and relearning a few things.

I have a feature selected in the dataframe. I want to determine the name of that layer that has a selection and return the value of the selected object in the field called "GNIS_Name" .

aprx <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>mp<SPAN class="punctuation token">.</SPAN>ArcGISProject<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"CURRENT"</SPAN><SPAN class="punctuation token">)</SPAN>

<SPAN class="comment token">#get selected layer </SPAN>
m <SPAN class="operator token">=</SPAN> aprx<SPAN class="punctuation token">.</SPAN>listMaps<SPAN class="punctuation token">(</SPAN>aprx<SPAN class="punctuation token">)</SPAN>
refLyr <SPAN class="operator token">=</SPAN> m<SPAN class="punctuation token">.</SPAN>listLayers<SPAN class="punctuation token">(</SPAN>aprx<SPAN class="punctuation token">)</SPAN> 
sel_lyrs <SPAN class="operator token">=</SPAN> refLyr<SPAN class="punctuation token">.</SPAN>getSelectionSet<SPAN class="punctuation token">(</SPAN>aprx<SPAN class="punctuation token">)</SPAN>

<SPAN class="comment token"># get name of selected stream    </SPAN>
Stream_Name <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>da<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>sel_lyrs<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"GNIS_Name"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"Any value"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string 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>

currently I get the error on line 5: 'list' object has no attribute 'listLayers'

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Accepted answers

JoshuaBixby

aprx <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>mp<SPAN class="punctuation token">.</SPAN>ArcGISProject<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"CURRENT"</SPAN><SPAN class="punctuation token">)</SPAN>
m <SPAN class="operator token">=</SPAN> aprx<SPAN class="punctuation token">.</SPAN>activeMap
lyrs <SPAN class="operator token">=</SPAN> m<SPAN class="punctuation token">.</SPAN>listLayers<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
<SPAN class="keyword token">for</SPAN> lyr <SPAN class="keyword token">in</SPAN> lyrs<SPAN class="punctuation token">:</SPAN>
    <SPAN class="keyword token">if</SPAN> lyr<SPAN class="punctuation token">.</SPAN>getSelectionSet<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
        <SPAN class="keyword token">print</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"{}: {}"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>lyr<SPAN class="punctuation token">.</SPAN>name<SPAN class="punctuation token">,</SPAN> lyr<SPAN class="punctuation token">.</SPAN>getSelectionSet<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><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>

All comments

jasongraham

well I am learning a lot of ways not to do it. This statement will print the all the names, not just the selected row

aprx <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>mp<SPAN class="punctuation token">.</SPAN>ArcGISProject<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"CURRENT"</SPAN><SPAN class="punctuation token">)</SPAN>
m <SPAN class="operator token">=</SPAN> aprx<SPAN class="punctuation token">.</SPAN>activeMap
lyrs <SPAN class="operator token">=</SPAN> m<SPAN class="punctuation token">.</SPAN>listLayers<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
<SPAN class="keyword token">for</SPAN> lyr <SPAN class="keyword token">in</SPAN> lyrs<SPAN class="punctuation token">:</SPAN>
    <SPAN class="keyword token">if</SPAN> lyr<SPAN class="punctuation token">.</SPAN>getSelectionSet<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
       sel_lyr <SPAN class="operator token">=</SPAN> lyr<SPAN class="punctuation token">.</SPAN>dataSource
       sel_oid <SPAN class="operator token">=</SPAN> lyr<SPAN class="punctuation token">.</SPAN>getSelectionSet<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>sel_lyr<SPAN class="punctuation token">,</SPAN><SPAN class="string token">"GNIS_Name"</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">as</SPAN> cursor<SPAN class="punctuation token">:</SPAN>
           <SPAN class="keyword token">for</SPAN> row <SPAN class="keyword token">in</SPAN> cursor<SPAN class="punctuation token">:</SPAN>
               <SPAN class="keyword token">print</SPAN><SPAN class="punctuation token">(</SPAN>row<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>

All I want is to know the path of the layer that has a selected feature, and know what the name is in the "GNIS_Name" Field of that selected feature

the lyr.getSelectionSet will give me the data source and the OID of the selected row.

I have tried to use an SQL in the search cursor like this

<SPAN class="keyword token">with</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>da<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>sel_lyr<SPAN class="punctuation token">,</SPAN><SPAN class="string token">"GNIS_Name"</SPAN><SPAN class="punctuation token">,</SPAN><SPAN class="string token">'OID@'</SPAN> <SPAN class="operator token">=</SPAN> sel_oid<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">as</SPAN> cursor<SPAN class="punctuation token">:</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN></SPAN>

and many variations like that, but always get a syntax error. is my entire approach wrong?

I orignially did the project in MB but elected to move to Python. I essentially need a Get Field Value function.

JoshuaBixby

There appears to be quite a bit going on, or going wrong, with your search cursor syntax. Starting with the first parameter, you are passing lyrs, which is a list. ArcPy cursors can't operate on Python lists. The second parameter seems OK, assuming "GNIS_NAME" is the name of the field in question. I am unclear what you mean by "Any Value" for the third parameter. The third positional parameter is an SQL WHERE clause, and I am not sure how to interpret what you are passing.

jasongraham

However, in my next step, I want to take the name of that selected layer and get a field value

Stream_Name <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>da<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>lyrs<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"GNIS_Name"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"Any value"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">""</SPAN><SPAN class="punctuation token">)</SPAN>‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN></SPAN>

I get the error

RuntimeError: 'in_table' is not a table or a featureclass

Am I taking the wrong approach? it seems to pass as a layer and not a feature class.

jasongraham

Thanks, this gets me a few steps closer.

JoshuaBixby

aprx <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>mp<SPAN class="punctuation token">.</SPAN>ArcGISProject<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"CURRENT"</SPAN><SPAN class="punctuation token">)</SPAN>
m <SPAN class="operator token">=</SPAN> aprx<SPAN class="punctuation token">.</SPAN>activeMap
lyrs <SPAN class="operator token">=</SPAN> m<SPAN class="punctuation token">.</SPAN>listLayers<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
<SPAN class="keyword token">for</SPAN> lyr <SPAN class="keyword token">in</SPAN> lyrs<SPAN class="punctuation token">:</SPAN>
    <SPAN class="keyword token">if</SPAN> lyr<SPAN class="punctuation token">.</SPAN>getSelectionSet<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
        <SPAN class="keyword token">print</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"{}: {}"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>lyr<SPAN class="punctuation token">.</SPAN>name<SPAN class="punctuation token">,</SPAN> lyr<SPAN class="punctuation token">.</SPAN>getSelectionSet<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><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>

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