Setter for **self.__read_only** attribute.

        :param value: Attribute value.
        :type value: bool

def read_only(self, value):
        """
        Setter for **self.__read_only** attribute.

        :param value: Attribute value.
        :type value: bool
        """

        if value is not None:
            assert type(value) is bool, "'{0}' attribute: '{1}' type is not 'bool'!".format("read_only", value)
        self.__read_only = value