Python ： 将类属性定义为类的实例

狠狠的套娃！

class static_property:
    def __init__(self, getter):
        self.__getter = getter

    def __get__(self, obj, objtype):
        return self.__getter(objtype)

    @staticmethod
    def __call__(getter_fn):
        return static_property(getter_fn)
class A:
    _bar = None

    def __init__(self, spam):
        self.spam = spam

    @static_property
    def bar(cls):
        if cls._bar is None:
            cls._bar = A(10)
        return cls._bar
print(A._bar)

非常的好用