title: Logging into facebook with python
body: <p>If I run the following code 10 times in a row, it will work about half the time and fail the rest. Anyone know why?</p>
  
  <pre><code>import urllib2, cookielib, re, os, sys
  
  class Facebook():
      def __init__(self, email, password):
          self.email = email
          self.password = password
  
          cj = cookielib.CookieJar()
          opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cj))
          opener.addheaders = [('Referer', 'http://login.facebook.com/login.php'),
                              ('Content-Type', 'application/x-www-form-urlencoded'),
                              ('User-Agent', 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.7) Gecko/20091221 Firefox/3.5.7 (.NET CLR 3.5.30729)')]
          self.opener = opener
  
      def login(self):
          url = 'https://login.facebook.com/login.php?login_attempt=1'
          data = "locale=en_US&amp;non_com_login=&amp;email="+self.email+"&amp;pass="+self.password+"&amp;lsd=20TOl"
  
          usock = self.opener.open('http://www.facebook.com')
          usock = self.opener.open(url, data)
          if "Logout" in usock.read():
              print "Logged in."
          else:
              print "failed login"
              print usock.read()
              sys.exit()
  
  f = Facebook("test@gmail.com", "asdfasdf")
  f.login()
  </code></pre>