如何在python中检查xml标记值是否为none

import xml.etree.ElementTree as ET

tree = ET.parse('file.xml')  # 解析XML文件
root = tree.getroot()  # 获取根节点

# 或者解析XML字符串
# root = ET.fromstring(xml_string)

element = root.find('tag_name')

if element is None:
    print("标记值为None")
else:
    print("标记值不为None")

import xml.etree.ElementTree as ET

tree = ET.parse('file.xml')  # 解析XML文件
root = tree.getroot()  # 获取根节点

element = root.find('tag_name')  # 查找指定的XML标记

if element is None:
    print("标记值为None")
else:
    print("标记值不为None")