code: def login(self):
          
          self._cookies = self.__get_rndnum_cookies()
          # print self._cookies
          UserCode, UserPwd = self._userid, self._userpsw
          Validate = self._cookies['LogonNumber']
          Submit = '%CC%E1+%BD%BB'
          headers = {'Referer': 'http://jwc.wyu.edu.cn/student/body.htm'}
          # save header
          self._headers = headers
          data = {
              'UserCode': UserCode,
              'UserPwd': UserPwd,
              'Validate': Validate,
              'Submit': Submit,
  
          }
          r = requests.post('http://jwc.wyu.edu.cn/student/logon.asp', data=data, headers=headers, cookies=self._cookies)
          # print r.content.decode(_.get_charset(r.content))
          return True if r.status_code == 200 else False
docs: 用户登陆
          :return: true if login successfully