一.
import urllib2
if __name__ == '__main__' :
url = 'http://www.csdn.net'
head ={}
head['User-Agent'] = 'Mozilla/5.0 (Linux; Android 4.0.4; Galaxy Nexus Build/IMM76B) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.133 Mobile Safari/535.19'
req = urllib2.Request(url,headers=head)
response = urllib2.urlopen(req)
html = response.read().decode('utf-8')
print html