python dict 相同key 合并value的实例

# #### dict中将key相同的字典合并在一个对象里"""a = {"a": 1, "b": 2, "c": 1}for k, v in a.iteritems():  tmp.setdefault(v, []).append(k)"""tmp = {}objs = OnlineScoringTeacher.objects.filter(  entry__message_ila__id=1038,  teacher=1,).select_related('entry')# 常规方法for obj in objs:  if obj.entry.subject_id not in tmp:    tmp.update({      obj.entry.subject_id: []    })  tmp[obj.entry.subject_id].append(obj)# 法二for obj in objs:  tmp.setdefault(obj.entry.subject_id, []).append(obj)