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I would like to update the Map_Feature_ID field with a String " WP_" and then follow the "WP_" with the OBJECTID field.

So I will end up with "WP_1", "WP_2" all the way to the end in the Map Feature ID field.

I am not sure if there is a way to do it with a python script or should I use the field calculator instead?

Map_Feature_ID update

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Just try in python in filed calculator as below-

"WP_" + str(!OBJECTID!)

N.B. The field going to be populated also needs to be string/text

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update_field = 'Map_Feature_ID'
expression = '"WP_{}".format(!OBJECTID!)'

arcpy.CalculateField_management(feature_class, update_field, expression, 'PYTHON')

http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00170000004m000000

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