python获取网页源代码

最简单的网页取源（不用模拟浏览器的情况）

 import requests
 def getHTML(url):
     try:
         r = requests.get(url,timeout=30)
         r.raise_for_status()
         r.encoding = 'utf-8'
         return r.text
     except:
         return ""
 url = "http://baidu.com"
 print(getHTML(url))