import requests
from bs4 import BeautifulSoup
# coding="utf-8"

url = 'https://passport.csdn.net/account/login'

sess = requests.session()
print sess
html1 = sess.get(url).text

soup1 = BeautifulSoup(html1)

p1 = soup1.select("[name=lt]")[0]["value"]
p2 = soup1.select("[name=execution]")[0]["value"]

data = {
        "lt": p1,
        "execution": p2,
        "_eventId": "submit",
        "username": "your name",
        "password": "your psw"
        }

r = sess.post(url, data)
print r.text

#below is the code how to reply your blog
commentUrl="http://blog.csdn.net/u012422829/comment/submit?id=46491779"
html2 = sess.get(url).text
commentdata = {
         "commentid":'',
         "content":"I am excited that I can reply my blog by my python code!",
         "replyId":'',
        }
headers = {'content-type': 'application/x-www-form-urlencoded',
           'User-Agent': 'Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.118 Safari/537.36'}
sess.headers.update(headers)
r2 = sess.post(commentUrl, commentdata)
print r2.text

#below is the code how to crawl the info  you want
msg = BeautifulSoup(sess.get('http://msg.csdn.net/').text)
for li in msg.select(".user_name"):
    print li.text


#below is the code how to up your blog in the home page of CSDN
url3='http://blog.csdn.net/common/digg.html?id=46541445&blog=1248879&user=u012422829&action=up'
msg = BeautifulSoup(sess.get(url3).text)
print msg