code: def ruokuai_captcha_handler(self, params, image_url):
          
  
          headers = {
              'Connection': 'Keep-Alive',
              'Expect': '100-continue',
              'User-Agent': 'ben',
          }
          image_data = requests.get(image_url).content
          files = {'image': ('check_code.png', image_data)}
          r = requests.post(
              'http://api.ruokuai.com/create.json',
              data=params,
              files=files,
              headers=headers
          )
          verify_code_dict = r.json()
          if verify_code_dict:
              if 'Error' in verify_code_dict.keys():
                  print (verify_code_dict['Error'])
                  return ''
              verify_code = verify_code_dict.get('Result', '')
          else:
              print ('rk failed ', verify_code_dict)
              return ''
  
          return verify_code
docs: 若快自动识别验证码, 文档见: http://wiki.ruokuai.com/