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Esri Python script to edit multiple metadata elements failure

Geographic Information Systems Asked on December 29, 2021

import os
import sys
import xml.etree.ElementTree as ET
import arcpy
from arcpy import metadata as md

# Script arguments...
Source_Metadata = arcpy.GetParameter(0)

# Local variables
#    new purpose text
newPurpose = "This is new text for an existing Purpose metadata element."
newCredits = "This is text for a new Credits metadata element."


# function to update purpose and credits in metadata
def update_metadata(root):
    num_elements = 0

    # modify purpose element's text
    # there is only supposed to be one purpose element in metadata
    # replace purpose element text if element exists
    # if element doesn't exist, do nothing
    purposeEls = root.findall(".//idPurp")
    for element in purposeEls:
        if element.text is not None:
            element.text = newPurpose
            num_elements += 1

    # add credits element to dataIdInfo parent, if the parent exists
    # ISO allows many dataIdInfo groups; ArcGIS supports only one, so get the 1st
    # ISO allows many idCredit elements, and many are supported in ArcGIS
    # append a new idCredit element with appropriate text, existing elements remain
    dataIdInfoEls = root.findall("./dataIdInfo[1]")
    for element in dataIdInfoEls:
        if element:
            newCreditEl = ET.SubElement(element, "idCredit")
            newCreditEl.text = newCredits
            num_elements += 1

    return num_elements


# get and save item metadata
for item in Source_Metadata:
    arcpy.AddMessage("Item: {0}".format(item))
    
    # get the item's metadata xml
    item_md = md.Metadata(item)
    metadata_xml_string = item_md.xml
    
    # create an ElementTree object from the metadata XML string
    root = ET.fromstring(metadata_xml_string)

    # call the update_metadata function to modify the item's metadata
    changes = update_metadata(root)
    
    if changes > 0:
        # get modified XML
        updated_xml_string = ET.tostring(root, encoding="utf-8")
        
        # import result back into metadata 
        arcpy.AddMessage("Saving updated metadata with the item...")
        item_md.xml = updated_xml_string
        item_md.save()
    else:
        arcpy.AddMessage("No changes to save")


arcpy.AddMessage('Finished updating metadata for all source metadata items')

Trying to take this Esri-sourced script to update multiple metadata elements. If I run this in a standalone script without editing, it doesn’t do anything, no errors. If I take the script and create a script tool in a GDB inside of ArcGIS Pro, it fails when I select the XML file as a parameter. What do I need to do to get this script to work on my metadata XML?

The script (meant for ArcGIS Pro) was sourced from:
https://pro.arcgis.com/en/pro-app/arcpy/metadata/migrating-from-arcmap-to-arcgis-pro.htm#ESRI_SECTION1_098BC26422304FAE96A19FB4B6528E07

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