starter_youtubeapi.py

import httplib2
import os
import sys

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_secret.json"

YOUTUBE_READ_WRITE_SSL_SCOPE = "https://www.googleapis.com/auth/youtube.readonly"
API_SERVICE_NAME = "youtube"
API_VERSION = "v3"

MISSING_CLIENT_SECRETS_MESSAGE = "WARNING: Please configure OAuth 2.0"

def get_authenticated_service(args):
  flow = flow_from_clientsecrets(CLIENT_SECRETS_FILE, scope=YOUTUBE_READ_WRITE_SSL_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(API_SERVICE_NAME, API_VERSION,
      http=credentials.authorize(httplib2.Http()))

args = argparser.parse_args()
service = get_authenticated_service(args)
results = service.channels().list(**kwargs).execute()