Guido van Rossum <gu...@python.org> added the comment:

In mypy there would be no difference between a cached property and a normal one 
-- the type is the same either way. Caching is the quintessential runtime 
behavior -- it shouldn't matter for semantics, only for performance. (True, 
sometimes there are more subtle semantics that require caching past the first 
call, but this is beyond the realm of a type checker, which cannot typically 
tell whether a call is the first or not.)

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34995>
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