def logging_active_formatter(self, value):
        """
        Setter for **self.__logging_active_formatter** attribute.

        :param value: Attribute value.
        :type value: unicode or QString
        """

        if value is not None:
            assert type(value) in (
                unicode, QString), "'{0}' attribute: '{1}' type is not 'unicode' or 'QString'!".format(
                "logging_active_formatter", value)
        self.__logging_active_formatter = value