DRF lazy Serializer

 class LazySerializer:
     def __init__(self, cls_name, **kwargs):
         self.cls_name = cls_name
         self.kwargs = kwargs

     class empty:
         pass

     def __call__(self, instance=None, data=empty, **kwargs) -> serializers.Serializer:
         return type(self.cls_name, (serializers.Serializer,), self.kwargs)(instance=instance, data=data, **kwargs)

 S = LazySerializer("PeopleSerializer", name=serializers.CharField(), age=serializers.IntegerField(min_value=1))
 s = S(data={"name": "xiaoming", "age": 18})
 s.is_valid()
 print(s.data) # {'name': 'xiaoming', 'age': 18}