Python 进阶必知——导包和元编程

运行这个代码，你会发现会打印出 new 一下

class SettingMeta(type):
    def __new__(cls, name, bases, attrs):
        print('new 一下')
        return super().__new__


class Setting(object, metaclass=SettingMeta):
    def __init__(self):
        print('初始化')