how to count character in arcpy script

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can somebody tell me how can i count character in a field either using field calculator or cursor.

i tried the below code :

import arcpy inputFeatureClass = arcpy.GetParameterAsText(0) InputField = arcpy.GetParameterAsText(1) expression = "len(!" + InputField + "!)" arcpy.AddField_management(inputFeatureClass,"CountChr","SHORT") arcpy.CalculateField_management(inputFeatureClass,"CountChr",expression,"PYTHON_9.3") but result is null.

i tried cursor :

import arcpy #taking input from user inputFeatureClass = arcpy.GetParameterAsText(0) InputField = arcpy.GetParameterAsText(1) arcpy.AddField_management(inputFeatureClass,"CountChr","SHORT") cursor = arcpy.da.UpdateCursor (inputFeatureClass, [InputField, "CountChr"]) for row in cursor: row[1] = len(row[0]) cursor.updateRow(row) del cursor but result is again null

can somebody tell me why this is happening ?



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