用描述符自定制靜态屬性property，靜态方法staticmethod，類方法classmethod

一.自定制靜态屬性property

class Lazyproperty:
    def __init__(self, func):
        self.func = func
    def __get__(self, instance, owner):
        print("get")
        if instance is None:
            return self
        res=self.func(instance)
        instance.__dict__[self.func.__name__]=res #setattr(instance,self.func.__name__,res)
        return res
    # def __set__(self, instance, value):
    #     pass
class Foo:
    @Lazyproperty  # jing=Lazyproperty(jing)  既是類裝飾器産生對象，又是描述符代理jing屬性
    def jing(self):
        return ("haha")
f1 = Foo()
print(f1.jing)
print(f1.jing)
print(f1.jing)
""""
    Lazyproperty既是裝飾器也是描述符
    裝飾器可以是函數，也可以是類，重點在于文法糖實作的内容意義
"""
           

二.靜态方法staticmethod

class Lazy_staticmethod:
    def __init__(self, func):
        self.func = func

    def __get__(self, instance, owner):
        print("get")

        def wapper(*args):
            self.func(*args)

        # print(self)
        # print(instance)
        return wapper


class fff:
    @Lazy_staticmethod  # foo=Lazy_staticmethod(foo)
    def foo(name):
        print("%s叫了啊啊啊啊" % name)

    @staticmethod
    def eoo(name):
        print("%s叫了呀呀呀呀" % name)


aa = fff()
aa.eoo("lily")
fff.eoo("nary")
aa.foo("haly")
fff.foo("linda")
           

三.類方法classmethod

class Lazy_classmethod:
    def __init__(self,func):
        self.func=func
    def __get__(self, instance, owner):
        print("get")
        def wrapper():
            if instance is None:
                self.func(owner)
            else:
                self.func(instance)
        # print(self)
        # print(instance)
        # print(owner)
        return wrapper
class Foo:
    tag=1
    @Lazy_classmethod                       #cvvvv=Lazy_classmethod(cvvvv)
    def cvvvv(cls):
        print("%s叫了喵貓喵"%cls.tag)
    @classmethod
    def bvvv(cls):
        print("%s叫了汪汪汪"%cls.tag)
f1=Foo()
# f1.bvvv()
# Foo.bvvv()
f1.cvvvv()
Foo.cvvvv()