元类(一)
1 # -*- coding: utf-8 -*-2 """
3 @Time : 2023-06-25 23:14
4 @Description :
5 @Author: Mr.Gu
6 """
7 import time
8 import types
9
10
11 class Meta(type):
12 def __new__(cls, name, bases, attrs):
13 for key, value in attrs.items():
14 if isinstance(value, types.FunctionType) and not key.startswith("_"):
15 attrs = property(value)
16 return super().__new__(cls, name, bases, attrs)
17
18 def __call__(cls, *args, **kwargs):
19 inst = super().__call__(*args, **kwargs)
20 inst.created_at = time.time()
21 return inst
22
23
24 class Valley(metaclass=Meta):
25 def func(self):
26 print("testing")
27
28
29 Valley().func
30 print(Valley().created_at)元类在工作中一般很少用到，除非手写框架
1、__new__创建类时调用
2、__call__创建与初始化类实例时调用
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