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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):
 """ Return the option value. :return: the option value in the correct format depending on the option """

        if type(self._value) is None:
            self._value = bytearray()
        opt_type = defines.OptionRegistry.LIST[self._number].value_type
        if opt_type == defines.INTEGER:
            if byte_len(self._value) > 0:
                return int(self._value)
            else:
                return defines.OptionRegistry.LIST[self._number].default
        return self._value