[issue21145] Add the @cached_property decorator

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

FYI there is discussion in bpo-34995 about the usage of @cached_property with abstract methods.

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nosy: +vstinner

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