code: def _proxy(self):
          
          if self._context is None:
              self._context = SyncListContext(
                  self._version,
                  service_sid=self._solution['service_sid'],
                  sid=self._solution['sid'],
              )
          return self._context
docs: Generate an instance context for the instance, the context is capable of
          performing various actions.  All instance actions are proxied to the context
  
          :returns: SyncListContext for this SyncListInstance
          :rtype: twilio.rest.sync.v1.service.sync_list.SyncListContext