title: error when trying to send a video using requests library Python
body: <p>I'm encountering an error code: <code>400</code> when trying to post a video file.</p>
  
  <p><strong>Error</strong>: </p>
  
  <pre class="lang-none prettyprint-override"><code>400 Bad Request
  b'{
      "ok":false,
      "error_code":400,
      "description":"Bad Request: there is no video in the request"
  }'
  </code></pre>
  
  <p>please advice what's wrong (the video file works and exist in the mentioned path)</p>
  
  <pre class="lang-py prettyprint-override"><code>def sendVideo(bot_token,bot_chatID):
      url = "https://api.telegram.org/bot"+ bot_token +"/sendVideo";
      files = {'file': open('C:/Users/myUser/Desktop/telegram/t_video.mp4', 'rb')}
      data = {'chat_id' : bot_chatID}
      r = requests.post(url, files=files)
      print(r.status_code, r.reason, r.content)
  </code></pre>