Sviatoslav Sydorenko added the comment:

Hi,

I've got similar need (caching exceptions). My use case is syscall, which is 
not going to result in something different regardless of the number of times 
it's called. But I'd like to be able to have exception already raised for me by 
lru_cache, so that I won't poke kernel with no need.

I'd suggest adding `cache_exceptions=False` key to the decorator to let user 
control whether it's worth enabling. This might be useful in stdlib.

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nosy: +webknjaz

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<https://bugs.python.org/issue21537>
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