Maybe you don't only want to check that foo returns a Callable. Maybe you also want to make sure that it returns a function that takes an int as an argument. ... With all this talk of callables, you ...

Now, every time you run the decorated function, lru_cache will check for a cached result for the inputs provided. If the result is in the cache, lru_cache will return it.

This post explains how to run Python apps on PC, Mac, Linux, Android, iOS, or even the web. Know your options when writing Python code!