def update_video(youtube, args):


  # Call the API's videos.list method to retrieve the video resource.
  videos_list_response = youtube.videos().list(
    id=args.video_id,
    part='snippet'
  ).execute()
  print ('Call the APIs videos.list method to retrieve the video resource')

  print(videos_list_response);


  # If the response does not contain an array of 'items' then the video was not found.
  if not videos_list_response['items']:
    print ('Video "%s" was not found.' % args.video_id)
    sys.exit(1)


  print ('Copiando todos los metadatos viejos del video')
  videos_list_snippet = videos_list_response['items'][0]['snippet']

  print('Cambiando el Valor del título del video');
  videos_list_snippet['title'] = "args.title"
  print(videos_list_snippet);


  # Update the video resource by calling the videos.update() method.
  videos_update_response = youtube.videos().update(
    part='snippet',
    body=dict(
      snippet=videos_list_response,
      id=args.video_id
    )).execute()


  print('The updated video metadata is:n' +
        'Title: ' + videos_update_response['snippet']['title'] + 'n')

print(videos_list_response);

{'publishedAt': '2018-04-15T23:40:19.000Z', 'channelId': 'xxxxx', 'title': 'Titulo Viejo', 'description': "Algo", 'defaultAudioLanguage': 'zxx'}

print('Cambiando el Valor del título del video');
  videos_list_snippet['title'] = "Titulo nuevo"
  print(videos_list_snippet);

{'publishedAt': '2018-04-15T23:40:19.000Z', 'channelId': 'xxxxx', 'title': 'Titulo nuevo', 'description': "Algo", 'defaultAudioLanguage': 'zxx'}

# Update the video resource by calling the videos.update() method.
  videos_update_response = youtube.videos().update(
    part='snippet',
    body=dict(
      snippet=videos_list_snippet,
      id=args.video_id
    )).execute()

An HTTP error 400 occurred:
b'{n "error": {n  "errors": [n   {n    "domain": "youtube.video",n    "reason": "invalidVideoMetadata",n    "message": "The request metadata is invalid.",n    "locationType": "other",n    "location": "body"n   }n  ],n  "code": 400,n  "message": "The request metadata is invalid."n }n}n'

# Update the video resource by calling the videos.update() method.
  videos_update_response = youtube.videos().update(
    part='snippet',
    body=dict(
      snippet=videos_list_response,
      id=args.video_id
    )).execute

An HTTP error 400 occurred:
b'{n "error": {n  "errors": [n   {n    "domain": "youtube.video",n    "reason": "invalidTitle",n    "message": "The request metadata specifies an invalid or empty video title.",n    "locationType": "other",n    "location": "body.snippet.title"n   }n  ],n  "code": 400,n  "message": "The request metadata specifies an invalid or empty video title."n }n}n