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

[hongweipeng]

hongweipeng <hongweichen8888 at sina.com> added the comment:

It can be solved by extending propery. `class cached_property(property):` . How about this idea?

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nosy: +hongweipeng

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38553>
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