__new__与__init__的区别

class User:
    def __new__(cls, *args, **kwargs):
        """控制对象的创建的过程,在__init__方法之前调用"""
        print(‘invoke __new__‘)
        return super().__new__(cls)  # 需要返回cls, 不然是不会调用__init__方法

    def __init__(self, name):
        """控制对象的属性操作,在调用该方法时,对象已经初始化完成,只是属性还没完善"""
        print(‘invoke __init__‘)
        self.name = name


if __name__ == ‘__main__‘:
    user = User(‘admin‘)

C:\Users\zhengqinfeng\AppData\Local\Programs\Python\Python37\python.exe E:/ws/python/LearnFlask/test/mooic/new_init.py
invoke __new__
invoke __init__

Process finished with exit code 0