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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 get(self, key):
 """ Constructs a SyncMapItemContext :param key: The key :returns: twilio.rest.preview.sync.service.sync_map.sync_map_item.SyncMapItemContext :rtype: twilio.rest.preview.sync.service.sync_map.sync_map_item.SyncMapItemContext """

        return SyncMapItemContext(
            self._version,
            service_sid=self._solution['service_sid'],
            map_sid=self._solution['map_sid'],
            key=key,
        )