这个代码为什么不能把网页爬下来，希望知道的能帮忙解答一下？

import requests
if name=="__main__":
#请求资源的地址
url = 'https://sogou.com/s'
header = {
'User-Agent':'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko)Chrome/78.0.3904.108 Safari/537.36'}
#请求参数
kw = input("请输入要查找的关键词:")
param = {"wd": kw}
#发起请求
res = requests.get(url = url ,params = param ,headers = header)
#解析文档
rese = res.text
#命名文件名
filename = kw + ".html"
#存储数据
with open(filename , "w",encoding='utf-8') as fp:
fp.write(rese)
print("写入成功")

https://www.cnblogs.com/andrew3/p/12791348.html