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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def value(self, value):
 """ Set the value of the option. :param value: the option value """

        opt_type = defines.OptionRegistry.LIST[self._number].value_type
        if opt_type == defines.INTEGER:
            if type(value) is not int:
                value = int(value)
            if byte_len(value) == 0:
                value = 0
        elif opt_type == defines.STRING:
            if type(value) is not str:
                value = str(value)
        elif opt_type == defines.OPAQUE:
            if type(value) is bytes:
                pass
            else:
                if value is not None:
                    value = bytes(value, "utf-8")

        self._value = value