In an ArcGIS Python Toolbox (pyt file), how do I specify a filter for a Value Table parameter? In my value table I have two columns. The first is a a field name derived from a selected table view and the second is a argument that should pass through with the field name. I would like to filter the list of available fields by data type, and then define a pick list of values for the second field.

I've searched high and low, but setting a filter for a value table is not obvious, or it may not be possible. When I attempt to specify a filter list for the field datatype in the usual way the toolbox fails to load with an error message of "line 118, in getParameterInfoAttributeError: 'NoneType' object has no attribute 'list'". Where line 118 is where I try to specify the filter as in the code below.

I can specify list of values to populate the table, but I really need this to be user selected.

field_map = arcpy.Parameter(
        displayName='Output Field Map',
field_map.columns = [['Field', 'Field Name'], ['GPString', 'NVEL Attribute']]
field_map.parameterDependencies = [trees_table.name]
#specifying a filter list fails
#field_map.filter.list = ['Short', 'Long', 'Float', 'Double']

1 Answer 1


Filters on Value Tables won't be available until 10.2.1. They'll be accessible as Parameter.filters, which will be a list of Filter objects the same as Parameter.value exists right now for single input parameters.

  • Thanks. Unfortunately that was the answer I expected. Any suggestions on an a workaround?
    – tharen
    Commented Oct 3, 2013 at 21:02
  • What I've done before is have a set of inputs above the value table (feature layer and field), once a layer is selected it populates the field input, and once a field is selected it clears out the two controls and adds a row to the value table. Hacky but worked okay for me. Commented Oct 3, 2013 at 21:24
  • That doesn't sound too bad. Thanks.
    – tharen
    Commented Oct 3, 2013 at 23:11
  • It's been a while since this question was first asked, and in the meantime 10.2.2 has been released. Is it now possible to filter on Value Tables?
    – mollys
    Commented Aug 6, 2014 at 21:12
  • 1
    At 10.2.2 it is not working (at least not like it does at 10.3). At 10.3 it is working with syntax like: param2.filters[0].type="ValueList" param2.filters[0].list = ["X"] to set the first column and param2.filters[1].type="ValueList" param2.filters[1].list=["x"] to set the second column. Thomas, how did you get it to work at 10.2.2? Commented May 11, 2015 at 16:16

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