code: def _proxy(self):
          
          if self._context is None:
              self._context = SyncListPermissionContext(
                  self._version,
                  service_sid=self._solution['service_sid'],
                  list_sid=self._solution['list_sid'],
                  identity=self._solution['identity'],
              )
          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: SyncListPermissionContext for this SyncListPermissionInstance
          :rtype: twilio.rest.sync.v1.service.sync_list.sync_list_permission.SyncListPermissionContext