When I calculate a field like this:
field_0="field_name0" arcpy.CalculateField_management("Layer", field_0, '!field_name1! / !field_name2!', "PYTHON_9.3")
It works! The field "field_name0" in the attribute table is populated with the value calculated from fields "field_name1" and "field_name2".
But, if I use variables instead of field names:
field_0="field_name0" field_1="!field_name1!" field_2="!field_name2!" arcpy.CalculateField_management("Layer", field_0, 'field_1 / field_2', "PYTHON_9.3")
I get this error:
Runtime error Traceback (most recent call last): File "", line 3, in File "c:\program files (x86)\arcgis\desktop10.2\arcpy\arcpy\management.py", line 3354, in CalculateField raise e ExecuteError: ERROR 000539: Error running expression: field_1/ field_2 Traceback (most recent call last):
File "", line 1, in NameError: name 'field_1' is not defined Failed to execute (CalculateField).
I want to use loops later on, that's why I want it to work with variables, and not simply with direct field names.