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Feature Layer Search and Create Feature Layer from Selected Features

BradGagliano

I am rather new to arcpy, however I am moving my AddIns from VB.net over to python. I am trying to search for a feature layer(s) and if found check to see if they have a selection. If so create a feature layer from that selection. If not do nothing.

I have attached a portion of the code I'm trying to use.

Thanks in advance.

Brad

CrashSelection.py.zip

efjone05_1-1644950832568.png

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Accepted answers

blake.terhune

Assuming this is the snippet of code you're asking about?

for lyr in arcpy.mapping.ListLayers(mxd, "CRASHES1999", df):
    if lyr == "CRASHES1999":
        desc = arcpy.Describe("CRASHES1999")
        in_table = "CRASHES1999"
        field_names = "YEAR"
        if desc.FIDSet:
            with arcpy.da.SearchCursor(in_table, field_names) as cursor:
                for row in cursor:
                    arcpy.MakeFeatureLayer_management(in_table, "SelectedCrashes1999")
        else:
            print "No Features Selected for CRASHES1999"

        del desc
        del in_table
        del field_names

Did you have a specific question or problem? Just guessing, but I see you're passing the field names for the search cursor as a string. According to the documentation, it needs to be a list or tuple. Try this instead:

field_names = ["YEAR"]

All comments

BradGagliano

It seems I have answered my own question.

I had

if lyr == "CRASHES1997":

I should have had

if lyr.name == "CRASHES1997":

blake.terhune

Assuming this is the snippet of code you're asking about?

for lyr in arcpy.mapping.ListLayers(mxd, "CRASHES1999", df):
    if lyr == "CRASHES1999":
        desc = arcpy.Describe("CRASHES1999")
        in_table = "CRASHES1999"
        field_names = "YEAR"
        if desc.FIDSet:
            with arcpy.da.SearchCursor(in_table, field_names) as cursor:
                for row in cursor:
                    arcpy.MakeFeatureLayer_management(in_table, "SelectedCrashes1999")
        else:
            print "No Features Selected for CRASHES1999"

        del desc
        del in_table
        del field_names

field_names = ["YEAR"]

BradGagliano

Thanks, this did seem to make it run smoother and quicker.

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