I have created python script tool in arcgis 10.1 as below. I am trying to take input parameter and passing to select statement.

There is error when i execute this tool.

import arcpy

from arcpy import env

env.workspace = "Database Connections\sc_dev.sde"

name = arcpy.GetParameterAsText(0)

arcpy.SelectLayerByAttribute_management ("SC.STATES", "NEW_SELECTION", " \"STATE_NAME\" = name")

The error is Failed to execute....Invalid expression..ERROR 000358


1 Answer 1


I am going to assume that name is set to a string and that STATE_NAME is a text field.

In which case I think this should work.


arcpy.SelectLayerByAttribute_management ("SC.STATES", "NEW_SELECTION", " \"STATE_NAME\" = name")


arcpy.SelectLayerByAttribute_management ("SC.STATES", "NEW_SELECTION", '"STATE_NAME" = ' + "'" + name + "'")

Note how I:

  • enclose "STATE_NAME" = inside single quotes (because the field name is delimited by double quotes);
  • enable the name variable to be evaluated by not having quotes around it
  • need to place single quotes around the value of name, which I do by enclosing each of them in double quotes.

The below syntax will also work, and is the way that I would normally do it nowadays:

arcpy.SelectLayerByAttribute_management ("SC.STATES", "NEW_SELECTION", "STATE_NAME = '{0}'".format(name))

The above uses Python formatting syntax to construct the where_clause.


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