如何以相同的日期格式更新属性值

Question

我想更改

publicationDateTime="2023-07-31T07:02:59+00:00"

属性。 我的xml是

<?xml version="1.0" encoding="UTF-8" standalone="no"?><Research xmlns="http://www.rixml.org/2005/3/RIXML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" createDateTime="2023-07-31T07:02:16+00:00" language="eng" researchID="GPS-4409687-0" xsi:schemaLocation="http://www.rixml.org/2005/3/RIXML http://www.rixml.org/assets/documents/schemas/RIXML-2_4.xsd">  
  <Product productID="12345-0">  
    <Source> 
      <Organization primaryIndicator="Yes" type="SellSideFirm"> 
        <OrganizationID idType="VendorCode">ABP</OrganizationID>  
        <OrganizationName nameType="Display">ABCDF</OrganizationName>  
      </Organization> 
    </Source>  
    <Content> 
      <Title>Novice</Title>  
    </Content>  
    <Context external="Yes">  
      <ProductDetails periodicalIndicator="No" publicationDateTime="2023-07-31T07:02:59+00:00"> 
        <ProductCategory productCategory="Support"/>  
      </ProductDetails>  
    </Context> 
  </Product> 
</Research>

这是我的代码

import os
import xml.etree.ElementTree as ET
import uuid
import time

ET.register_namespace('', "http://www.rixml.org/2005/3/RIXML")
ET.register_namespace('', "http://www.rixml.org/2005/3/RIXML")
OUTPUT_FOLDER = "OUTPUT/"
input_folder = "INPPUT/"
all_files = os.listdir(input_folder)
json_files = {f: f for f in all_files if f.endswith(".xml")}
json_files_keys = list(json_files.keys())
json_files_keys.sort()

for file_name in json_files_keys:
    print(file_name)
    xmlTree = ET.parse(input_folder+file_name)
    root = xmlTree.getroot()
    print(root)
    print(root.attrib)
    for child in root:
        print(child.attrib)
        pid = '2023-08-04T08:02:59+00:00'
        print(pid)
        child.set('publicationDateTime', pid)
    xmlTree.write(OUTPUT_FOLDER+file_name)
    print("written")

我无法更新属性。它被添加到根级别。

请建议如何在同一位置添加。

我是Python新手，如果这是一个非常明显的问题，我深表歉意。