Is this an amazing, or terrible idea?

Lets define a classproperty in Python such that it works as a property on both a class, and an instance:

class classproperty(object):

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

    def __get__(self, obj, cls):
        return self.func(cls, obj)

It can be used thusly:

class Example(object):

    def prop(cls, obj):
        return obj or cls

x = Example()
assert x.prop is x
assert Example.prop is Example

Is this a good idea, or a bad idea?

(Hint: I don't know.)

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