topic Re: ESRI python toolbox how to pass variables between tools in Python Questions

ESRI python toolbox how to pass variables between tools

AntEsk — Thu, 07 Dec 2023 01:04:47 GMT

i made a python toolbox with various tools to interact with a Portal. i set it up using a global variable that would hold the portal info so i dont have to get it for every tool. This created issues as other tools not in this toolbox would raise errors that this global varibale is not defined.

i defined the variable the Toolbox class __init__, i am confused how the __init__ method of the Toolbox class is being called when that toolbox is not open

That aside i know its not great practice to use global variables and i cant control the above issues so i went down the road of trying to pass the now non-global variable between the tools in the Toolbox by setting it as an attribute of Toolbox in the __init__ method and then inheriting the Toolbox class in each Tool Class

This ran in to the problem

"TypeError: Cannot create a consistent method resolution
order (MRO) for bases object, Toolbox"

so i can use the inheritance method as both of these classes must be already inherited into some class when it runs.

How can i pass variables either from the Toolbox class to each tool or even just between tools?

Re: ESRI python toolbox how to pass variables between tools

AntEsk — Thu, 07 Dec 2023 22:13:53 GMT

i could not figure out a way to do this, not sure that it is possible.

instead i went back to the global but I am creating the variable in the init of each tool if it hasn't been created. i have concluded that the changes to the Toolbox class i made must be getting inherited into Toolbox class that all tools use.

if anyone knows how to pass the variables btw tools let me know as i would prefer to not use the global

Re: ESRI python toolbox how to pass variables between tools

DonMorrison1 — Mon, 11 Dec 2023 23:20:34 GMT

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

Re: ESRI python toolbox how to pass variables between tools

AntEsk — Tue, 12 Dec 2023 21:33:17 GMT

Thansk for replying, that is basically what i have done, i just have the global defined in a function outside of the Tool class and called within the __inti__ of the tool so it only needs to be made once.