code: def requires_auth(func):
      
      @six.wraps(func)
      def wrapper(self, *args, **kwargs):
          if self.token_expired:
              self.authenticate()
          return func(self, *args, **kwargs)
      return wrapper
docs: Handle authentication checks.
  
      .. py:decorator:: requires_auth
  
          Checks if the token has expired and performs authentication if needed.