AttributeError with arcpy.AddMessage when printing field object defaultValue property

Clubdebambos — Thu, 27 Apr 2023 11:18:57 GMT

ArcGIS Pro 3.1 (also same error tested on 2.9)

Getting an AttributeError when using arcpy.AddMessage() to print the default values for fields.

AttributeError: Object: Error in parsing arguments for AddMessage

Original code...

import arcpy ## path to feature class fc = r"C:\Path\To\GDB\FeatureClass" ## describe the data and return a dictionary desc = arcpy.da.Describe(fc) ## for each field object in the fields property for field_obj in desc["fields"]: ## print the field name arcpy.AddMessage(field_obj.name) ## print the field defaultValue arcpy.AddMessage(field_obj.defaultValue)

Re: AttributeError with arcpy.AddMessage when printing field object defaultValue property

Clubdebambos — Thu, 27 Apr 2023 11:25:56 GMT

Figured it out shortly after original post.

ArcPy does not like a None value as input parameter for the AddMessage() function, replaced with string formatting below.

The defaultValue property was returning None for some fields. If you run the below it will throw the AttributeError, seen in original post, showing that the input to the AddMessage function must be convertible to a string.

## AttributeError arcpy.AddMessage(None)

topic Re: AttributeError with arcpy.AddMessage when printing field object defaultValue property in Python Questions

AttributeError with arcpy.AddMessage when printing field object defaultValue property

Re: AttributeError with arcpy.AddMessage when printing field object defaultValue property