python requests库添加headers出错

import requests

url = "https://movie.douban.com/top250"
headers = {'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36'}

res = requests.get(url,headers=headers)

print (res)

https://www.cnblogs.com/stuqx/p/7253321.html

 headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36'}

headers是个字典，你要加上键名啊