Latest Contributions by DonMorrison1

I've attached a simple example (counts the number of times UpdateParameters is called) of how I share data between tools in a python toolbox. My guess is that it is similar to what you are already doing - using globals. There probably is a more elegant way but I've run into the same problems that you describe and finally settled on this because it does work. # -*- coding: utf-8 -*- import arcpy tool_1_data = dict() tool_2_data = dict() class Toolbox(object): def __init__(self): self.label = "Toolbox" self.alias = "toolbox" self.tools = [Tool_1, Tool_2] def get_tool_data (tool_data_dict, tool_data_key): if tool_data_key in tool_data_dict.keys(): return tool_data_dict[tool_data_key] else: return None class Tool_1(object): def __init__(self): self.label = "Tool_1" self.description = "" self.canRunInBackground = False def getParameterInfo(self): global tool_1_data if len(tool_1_data) == 0: tool_1_data = {'my_count': 0} my_count = arcpy.Parameter(displayName="My Count", name="my_count", datatype="GPLong", parameterType="Optional", direction="Input") other_count = arcpy.Parameter(displayName="Other Count", name="other_count", datatype="GPLong", parameterType="Optional", direction="Input") return [my_count, other_count] def updateParameters(self, parameters): global tool_1_data global tool_2_data tool_1_data['my_count'] += 1 parameters[0].value = get_tool_data(tool_1_data, 'my_count') parameters[1].value = get_tool_data(tool_2_data, 'my_count') return def execute(self, parameters, messages): return class Tool_2(object): def __init__(self): self.label = "Tool_2" self.description = "" self.canRunInBackground = False def getParameterInfo(self): global tool_2_data if len(tool_2_data) == 0: tool_2_data = {'my_count': 0} my_count = arcpy.Parameter(displayName="My Count", name="my_count", datatype="GPLong", parameterType="Optional", direction="Input") other_count = arcpy.Parameter(displayName="Other Count", name="other_count", datatype="GPLong", parameterType="Optional", direction="Input") return [my_count, other_count] def updateParameters(self, parameters): global tool_1_data global tool_2_data tool_2_data['my_count'] += 1 parameters[0].value = get_tool_data(tool_2_data, 'my_count') parameters[1].value = get_tool_data(tool_1_data, 'my_count') return def execute(self, parameters, messages): return    ... View more

Would something like this work? p1.filter.list = [f.name for f in arcpy.ListFields(p0.value) if f.name not in ['OBJECTID', '<other undesireable fields>']] ... View more

"displayName" can only be set in the getParameters method.   From this page: Several properties, including name, displayName, datatype, direction, and parameterType, establish the characteristics of a tool and cannot be modified during validation methods (such as updateMessages and updateParameters). ... View more