requests

import requests

requests.ConnectionError

request.HTTPError

requests.URLError

requests.URLRequired

requests.TooManyRedirects

requests.ConnectTimeout

requests.Timeout

r.raise_for_status

def getHTMLText(url):
    try:
        r = requests.get(url, timeout=30)
        r.raise_for_status()
        r.encoding = r.aparent_encoding

原文：http://www.cnblogs.com/jinggo/p/7720165.html