如何在python中实现既是实例方法又是类方法的函数？

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

    def __get__(self, instance, owner):
        if instance is None:
            return self.func.__get__(owner, owner.__class__)
        return self.func.__get__(instance, owner)

    def __call__(self, *args, **kwargs):
        return self.func(*args, **kwargs)


class MyClass:
    @DualMethod
    def my_method(self, x):
        print("Instance method:", x)

    @classmethod
    @DualMethod
    def my_classmethod(cls, x):
        print("Class method:", x)

obj = MyClass()
obj.my_method(10)  # 调用实例方法
MyClass.my_method(20)  # 调用类方法
MyClass.my_classmethod(30)  # 调用类方法

Instance method: 10
Instance method: 20
Class method: 30