code: def from_events(self, instance, ev_args, ctx):
          
  
          tag = ev_args[0], ev_args[1]
          cls = self._tag_map[tag]
          obj = yield from cls.parse_events(ev_args, ctx)
          mapping = self.__get__(instance, type(instance))
          mapping[self.key(obj)].append(obj)
docs: Like :meth:`.ChildList.from_events`, but the object is appended to the
          list associated with its tag in the dict.