参考：
http://www.cnblogs.com/txw1958/archive/2012/03/12/2392067.html
http://www.cnblogs.com/chenyg32/archive/2013/06/04/3116317.html
http://docs.python.org/2/howto/urllib2.html
http://*.com/questions/189555/how-to-use-python-to-login-to-a-webpage-and-retrieve-cookies-for-later-usage
1 import urllib,urllib2,cookielib 2 from BeautifulSoup import BeautifulSoup 3 url=‘http://www.renren.com/SysHome.do‘ 4 resp1=urllib2.urlopen(url) 5 source=resp1.read() 6 soup1=BeautifulSoup(source) 7 user_agent = ‘Mozilla/4.0 (compatible; MSIE 5.5; Windows NT)‘ 8 headers = { ‘User-Agent‘ : user_agent} 9 params={‘domain‘:‘renren.com‘,‘origURL‘:‘http://www.renren.com/indexcon‘,‘email‘:‘*********@****.com‘,‘password‘:‘******‘} 10 params=urllib.urlencode(params) 11 params=params.encode(‘ISO-8859-1‘) 12 cj=cookielib.CookieJar() 13 opener=urllib2.build_opener(urllib2.HTTPCookieProcessor(cj)) 14 urllib2.install_opener(opener) 15 resp2=urllib2.Request(‘http://www.renren.com/PLogin.do‘,params,headers) 16 response = urllib2.urlopen(resp2) 17 # print opener.open(resp2) 18 the_page=response.read() 19 print the_page