1.使用 urllib2 实现
#! /usr/bin/env python
# -*- coding=utf-8 -*-
import urllib2
url="https://www.baidu.com"
req_header = {"User-Agent":"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11",
"Accept":"text/html;q=0.9,*/*;q=0.8",
"Accept-Charset":"ISO-
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