flow = InstalledAppFlow.from_client_secrets_file(
    client_secrets_file=client_secret_file,
    scopes=['https://www.googleapis.com/auth/userinfo.email', 'openid', 'https://www.googleapis.com/auth/userinfo.profile'])
return flow.run_local_server(
    host='localhost',
    port=port,
    authorization_prompt_message='Please visit this URL: {url}',
    success_message='The auth flow is complete; you may close this window.',
    open_browser=True,
    timeout_seconds=20)