code: def main(argv):
    
    p = argparse.ArgumentParser()
    p.add_argument('-s', '--scope', nargs='+')
    p.add_argument('-o', '--oauth-service', default='google')
    p.add_argument('-i', '--client-id')
    p.add_argument('-x', '--client-secret')
    p.add_argument('-r', '--redirect-uri')
    p.add_argument('-f', '--client-secrets')
    args = p.parse_args(argv)
    client_args = (args.client_id, args.client_secret, args.client_id)
    if any(client_args) and not all(client_args):
      print('Must provide none of client-id, client-secret and redirect-uri;'
            ' or all of them.')
      p.print_usage()
      return 1
    print args.scope
    if not args.scope:
      print('Scope must be provided.')
      p.print_usage()
      return 1
    config = WizardClientConfig()
    config.scope = ' '.join(args.scope)
    print(run_local(UserOAuth2(config))['access_token'])
    return 0
docs: Entry point for command line script to perform OAuth 2.0.