How to reference a tool script when validating?

Question

I've defined a simple Python script to download a file: import arcpy import requests import os import urllib def download_file(url): output_file_name = get_output_file_name(url) with open(output_file_name, 'wb') as output_file: response = requests.get(url) output_file.write(response.content) arcpy.SetParameterAsText(1, output_file_name) def get_output_file_name(url): path = urllib.parse.urlparse(url).path base_file_name = os.path.basename(path) scratch_folder = arcpy.env.scratchFolder return os.path.join(scratch_folder, base_file_name) if __name__ == "__main__": url = arcpy.GetParameterAsText(0) download_file(url)‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ and, I've created a script tool in a custom toolbox with an input parameter (the url of the file to download) and an output parameter (the path to the downloaded file). To validate the tool, I need to set the value of the output parameter. I have a method for this in my script (get_output_file_name). How can I call this from within my Tool Validator code in the custom toolbox?

RandyBurton · Answer

Untested, but perhaps something like: import arcpy import requests import os import urllib class ToolValidator: def __init__(self): self.params = arcpy.GetParameterInfo() def initializeParameters(self): # (initializeParameters code here) return def updateParameters(self): if self.params[0].altered: if self.params[0].value: # a url has been entered in first parameter url = self.params[0].value path = urllib.parse.urlparse(url).path base_file_name = os.path.basename(path) scratch_folder = arcpy.env.scratchFolder self.params[1].value = os.path.join(scratch_folder, base_file_name) return def updateMessages(self): # (updateMessages code here) return‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ Then use: output_file_name = arcpy.GetParameterAsText(1).