为什么opener.addheaders报错？(已解决，不用进来了，删了吧。。）

azzzzzz

import urllib.request


url = "http://www.ip111.cn/"

proxy_support = urllib.request.ProxyHandler({"http":"117.88.176.252:3000"})

headers = ("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36")
opener = urllib.request.build_opener(proxy_support)
opener.addheaders[headers]

urllib.request.install_opener(opener)

response = urllib.request.urlopen(url)

html = response.read().decode("utf-8")

print(html)

报错信息：
Traceback (most recent call last):
  File "D:\python 3.8\资料\爬虫学习\proxy_eg.py", line 10, in <module>
    opener.addheaders[headers]
TypeError: list indices must be integers or slices, not tuple

按照小甲鱼教程这样写报错，网上找了很多都是这样写的，找手册上面找不到这个方法，不知道怎么回事求大佬解答！

kirte

汗