<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def svalue(self):
 """Get serialized value. :rtype: str """


        result = self._svalue

        if result is None:  # try to get svalue from value if svalue is None

            try:
                value = self.value

            except Parameter.Error:
                pass

            else:
                result = self._svalue = self.serializer(value)

        return result