title: Get photo in telegram bot through pyTelegramBotAPI
body: <p>I'm trying to develop a simple bot, that can retrieve photo from user and then do several operations with media file. 
  I'm using telebot (<a href="https://github.com/eternnoir/pyTelegramBotAPI" rel="nofollow noreferrer">https://github.com/eternnoir/pyTelegramBotAPI</a>) for design. </p>
  
  <p>As far as I can see from the wiki, I can divide income messages by <code>content_type</code> using special handlers. </p>
  
  <p>However, when I wrote such simple method: </p>
  
  <pre><code>#main.py
  @bot.message_handler(content_types= ["photo"])
  def verifyUser(message):
      print ("Got photo")
      percent = userFace.verify(message.photo, config.photoToCompare)
      bot.send_message(message.chat.id, "Percentage: " + str(percent))
  
  def getData(json_string):
      updates = telebot.types.Update.de_json(json_string)
      bot.process_new_updates([updates])
  
  
  #server.py
  app = Flask(__name__)
  
  @app.route("/", methods=["POST", "GET"])
  def hello():
      json_string = request.get_data()
      getData(json_string)
      print("....")
      print(request.data)
      return 'test is runing'
  
  if __name__ == '__main__':
      app.run(host='0.0.0.0')
  </code></pre>
  
  <p>I get such mistake which I can't classify whether I'm doing something wrong or there is a problem with API</p>
  
  <pre><code>obj = cls.check_json(json_type)
  File "/usr/local/lib/python2.7/dist-packages/telebot/types.py", line 77, in check_json
  return json.loads(json_type)
  File "/usr/lib/python2.7/json/__init__.py", line 339, in loads
  return _default_decoder.decode(s)
  File "/usr/lib/python2.7/json/decoder.py", line 364, in decode
  obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python2.7/json/decoder.py", line 382, in raw_decode
  raise ValueError("No JSON object could be decoded")
  ValueError: No JSON object could be decoded
  </code></pre>
  
  <p>I'm new to bot design, so I don't know, whether I'm following the right way. I will be glad to hear the common practice of working with photo media files.</p>