day07_09 metaclass创建一个类

__author__ = "Alex Li"


class MyType(type):
    def __init__(self, what, bases=None, dict=None):
        print("--MyType init---")
        super(MyType, self).__init__(what, bases, dict)

    def __call__(self, *args, **kwargs):
        print("--MyType call---")

        obj = self.__new__(self, *args, **kwargs)
        obj.data = {"name":111}
        self.__init__(obj, *args, **kwargs)


class Foo(object):

    __metaclass__ = MyType

    def __init__(self, name):
        self.name = name
        print("Foo ---init__")

    #默认自带方法__new__于__init__之前执行，用于创建实例(不用写)
    def __new__(cls, *args, **kwargs):
        print("Foo --new--")
        print(object.__new__(cls))
        return object.__new__(cls) #继承父亲的__new__方法



# 第一阶段：解释器从上到下执行代码创建Foo类
# 第二阶段：通过Foo类创建obj对象
obj = Foo("Alex")
print(obj.name)

标签：__,self,09,day07,init,print,new,Foo,metaclass
来源： https://www.cnblogs.com/netflix/p/14855016.html