修改xml文件的某个属性值

#coding:utf-8
import xml.etree.ElementTree as ET
import sys

def main():
    tree =ET.ElementTree(file=r"LogPubChannelConfigbak.xml")
    root=tree.getroot()
    for elem in tree.iter(tag='channel'):
        elem.attrib['userId']="88888"

    tree.write(r"LogPubChannelConfigbak.xml")


if __name__ == '__main__':
    main()