类的初始化，生成 python 2.x 有效果

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__")

    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)