code: def scope(self, scope):
          
          if scope is None:
              raise ValueError("Invalid value for `scope`, must not be `None`")  # noqa: E501
          allowed_values = ["CLUSTER", "CUSTOMER", "USER"]  # noqa: E501
          if scope not in allowed_values:
              raise ValueError(
                  "Invalid value for `scope` ({0}), must be one of {1}"  # noqa: E501
                  .format(scope, allowed_values)
              )
  
          self._scope = scope
docs: Sets the scope of this Message.
  
          The audience scope that this message should reach  # noqa: E501
  
          :param scope: The scope of this Message.  # noqa: E501
          :type: str