I'm trying to add a part of my filename into a field that i'd created, but it comes with the following error:

Traceback (most recent call last): File "Z:\04 - Temp\Charles\NDVI_tempo\NDVI_py3.tbx#Script_NDVIpy3.py", line 50, in File "c:\program files\arcgis\pro\Resources\arcpy\arcpy\management.py", line 3019, in CalculateField raise e File "c:\program files\arcgis\pro\Resources\arcpy\arcpy\management.py", line 3016, in CalculateField retval = convertArcObjectToPythonObject(gp.CalculateField_management(*gp_fixargs((in_table, field, expression, expression_type, code_block), True))) File "c:\program files\arcgis\pro\Resources\arcpy\arcpy\geoprocessing_base.py", line 506, in return lambda *args: val(*gp_fixargs(args, True)) arcgisscripting.ExecuteError: ERROR 000539: Error running expression: test Traceback (most recent call last): File "", line 1, in NameError: name 'test' is not defined

Failed to execute (CalculateField).
Failed to execute (Script).

This is the script that i wrote:

intershp = 'Z:\\04 - Temp\\Charles\\NDVI_tempo\\NAL\\intershp.shp'

arcpy.AddField_management (intershp, "Data", "TEXT", "", "", "", "", "", "", "")

tiff_name = tiff.split("_")[0]
field_name = "{}".format(tiff_name[0:4])

arcpy.CalculateField_management (intershp, "Data", field_name, "", "")
  • File "", line 1, in NameError: name 'test' is not defined. Where is test coming from i do not see that in the code you posted.
    – NULL.Dude
    Commented Oct 2, 2017 at 14:01
  • "test" is a part of the filename, I used "for tiff in rasters" before
    – Charlera
    Commented Oct 2, 2017 at 14:04
  • 1
    intershp = r'Z:\04- you need to raw string your parameter
    – Midavalo
    Commented Oct 2, 2017 at 14:11
  • It still don't works, the shape haven't any problem at all, the information is from the raster file
    – Charlera
    Commented Oct 2, 2017 at 14:16

1 Answer 1


Actually I found the solution!

The expression field couldn't be 'field_name', it has to be "'" + field_name + "'"

  • huzzah! I was seconds away posting that answer. Good work :) Here's the documentation where I found it mentioned: pro.arcgis.com/en/pro-app/tool-reference/data-management/…
    – mr.adam
    Commented Oct 2, 2017 at 14:36
  • 1
    it's good practice to mark your own answer with the green checkmark... better to officially answer your own question than to leave an unanswered question out there.
    – mr.adam
    Commented Oct 2, 2017 at 16:42
  • "You can accept your own answer in 2 days", i'll mark it! Thanks for the advice
    – Charlera
    Commented Oct 2, 2017 at 17:40

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