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@isagalaev you don't need another library! From the docs for lru_cache: https://docs.python.org/3/library/functools.html#functools.lru_cache

> The original underlying function is accessible through the __wrapped__ attribute. This is useful for introspection, for bypassing the cache

So you can easily do something along the lines of:

try:
cached_func.__wrapped__(*args)
except SomeSpecificError:
cached_func(*args)