[issue21145] Add the @cached_property decorator

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Will that implementation cause a memory leak? Won't the lru_cache have
> a dict mapping {self: result}, meaning that `self` will live forever,
> instead of storing result in self.__dict__, where the lifetimes are
> correct.

Oh, you're right. Sorry for the noise.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21145>
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