[issue38553] Document functools.cached_property supports value updating and clearing

[Laurie Opperman]

Laurie Opperman <laurie_opperman at hotmail.com> added the comment:

@hongweipeng What can be solved? Do you mean `functools.cached_property` should inherit `property`? First, this would break existing code dependant on the functionality of `functools.cached_property` (admittedly, Python 3.8 was release less than two weeks ago). Second, that seems like arbitrary restriction: I'd prefer just to update the documentation

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<https://bugs.python.org/issue38553>
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