Setter for **self.__verbosity_level** attribute.

        :param value: Attribute value.
        :type value: int

def verbosity_level(self, value):
        """
        Setter for **self.__verbosity_level** attribute.

        :param value: Attribute value.
        :type value: int
        """

        if value is not None:
            assert type(value) is int, "'{0}' attribute: '{1}' type is not 'int'!".format("verbosity_level", value)
            assert value >= 0 and value <= 4, "'{0}' attribute: Value need to be exactly beetween 0 and 4!".format(
                "verbosity_level")
        self.__verbosity_level = value