[issue21145] Add the @cached_property decorator

[Daniel Greenfeld]

Daniel Greenfeld added the comment:

I'm delighted to see a patch submitted, but I'm concerned that it isn't thread safe. This was implemented in the cached-property package I maintain:

* https://github.com/pydanny/cached-property/issues/6
* https://github.com/pydanny/cached-property/pull/9
* https://github.com/pydanny/cached-property#working-with-threads

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