code: def get_auth_stdin(refresh_token_filename, manual_login=False):
      
      refresh_token_cache = RefreshTokenCache(refresh_token_filename)
      return get_auth(
          CredentialsPrompt(), refresh_token_cache, manual_login=manual_login
      )
docs: Simple wrapper for :func:`get_auth` that prompts the user using stdin.
  
      Args:
          refresh_token_filename (str): Path to file where refresh token will be
              cached.
          manual_login (bool): If true, prompt user to log in through a browser
              and enter authorization code manually. Defaults to false.
  
      Raises:
          GoogleAuthError: If authentication with Google fails.