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Error using ArcPy SearchCursor to get list of unique values in multiple fields

Geographic Information Systems Asked by AlexS1 on November 7, 2020

I’m trying to extract a list of unique values in two fields in a shapefile. I think I am misunderstanding how the search cursor works, because I get the same error on which ever variable (x or y) I put second.

I’m following the answer here, and it works for just one field, but not 2+

Code:

with arcpy.da.SearchCursor(myshp, ['myid', 'myname']) as cursor:
    x = sorted({row[0] for row in cursor})
    y = sorted({row[1] for row in cursor})

Error:

y = sorted({row[1] for row in cursor})
IndexError: list index out of range

One Answer

You can use a generator expression for this. For example:

import arcpy

fc = r'C:pathtogeodatabase.gdbfeatureclass'

unique_list1 = set(row[0] for row in arcpy.da.SearchCursor(fc, 'myid'))
unique_list2 = set(row[0] for row in arcpy.da.SearchCursor(fc, 'myname'))

Correct answer by Aaron on November 7, 2020

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