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I'm looking for a Python 3/Aracade script to field calculate ATT_NAME in an attachment table based off of the REL_GLOBALID.

So where REL_GLOBALID is {67CECF26-9BE8-4E37-9408-3BC156DA51C0}, I'd like to rename ATT_NAME to Photo 1 and then where there is another attachment with the same REL_GLOBALID, I'd like that to be changed to Photo 2. See attached photo

example photo

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This task is very easily (and quickly) accomplished in ArcGIS Pro with an update cursor. See my practical example below. You can see the names updates between table 1 and table 2. You will need to adjust the fields variable at the top of the script, as well as adjust the 'test_table' name in the update cursor on line three. The 'test_table' can be replaced with a string of the name of your table in the current map document, or a string pointing to the path of the file on disk.

fields = ['GUID', 'ATT_NAME']
featureClass = 'test_table'
update_dictionary = {}

with arcpy.da.UpdateCursor(featureClass, fields) as updates:
    for row in updates:
        if row[0] not in update_dictionary.keys():
            update_dictionary[row[0]] = 1
        else:
            update_dictionary[row[0]] += 1
        row[1] = 'Photo ' + str(update_dictionary[row[0]])
        updates.updateRow(row)

BEFORE CODE enter image description here

AFTER CODE enter image description here

GIF OF PROCESS enter image description here

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    Oh I use ShareX! Dude, it is friggen AWESOME. getsharex.com
    – John
    Jan 26 '21 at 16:43

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