python如何下载网页？

import urllib.request

def getHtml(url):

 html = urllib.request.urlopen(url).read()

 return html

def saveHtml(file_name, file_content):

 # 注意windows文件命名的禁用符，比如 /

 with open(file_name.replace('/', '_') + ".html", "wb") as f:

  # 写文件用bytes而不是str，所以要转码

  f.write(file_content)

aurl = "https://www.py.cn/faq/python/18220.html"

html = getHtml(aurl)

saveHtml("sduview", html)

print("下载成功")