update title of video using youtube api

youtube_update.py

# original code: https://developers.google.com/youtube/v3/docs/videos/update
import datetime
import sys

import httplib2
from apiclient.discovery import build
from apiclient.errors import HttpError
from oauth2client.client import flow_from_clientsecrets
from oauth2client.file import Storage
from oauth2client.tools import argparser, run_flow

CLIENT_SECRETS_FILE = "client_secrets.json"
YOUTUBE_READ_WRITE_SCOPE = "https://www.googleapis.com/auth/youtube"
YOUTUBE_API_SERVICE_NAME = "youtube"
YOUTUBE_API_VERSION = "v3"

def get_authenticated_service(args):
  flow = flow_from_clientsecrets(CLIENT_SECRETS_FILE,
    scope=YOUTUBE_READ_WRITE_SCOPE,
    message='MISSING_CLIENT_SECRETS_MESSAGE')

  storage = Storage("%s-oauth2.json" % sys.argv[0])
  credentials = storage.get()

  if credentials is None or credentials.invalid:
    credentials = run_flow(flow, storage, args)

  return build(YOUTUBE_API_SERVICE_NAME, YOUTUBE_API_VERSION,
    http=credentials.authorize(httplib2.Http()))

def update_video(youtube, options):
  now = datetime.datetime.now()
  a = {}
  a['title'] = f'{now}'
  a['categoryId'] = '20'

  videos_update_response = youtube.videos().update(
    part='snippet',
    body=dict(
      snippet=a,
      id=options.video_id
    )).execute()

if __name__ == "__main__":
  argparser.add_argument("--video-id", help="ID of video to update.",
    required=True)
  args = argparser.parse_args()

  youtube = get_authenticated_service(args)
  try:
    update_video(youtube, args)
  except HttpError as e:
    print("An HTTP error %d occurred:\n%s" % (e.resp.status, e.content))
  else:
    print("Something was added to video id '%s'." % (args.video_id))