What does `functools.lru_cache` use as a cache key when decorating a function?

Question

Python Professional — Hard

What does `functools.lru_cache` use as a cache key when decorating a function?

Accepted Answer

`functools.lru_cache` uses a tuple of all positional and keyword arguments as the cache key when decorating a function. This ensures that the cache key is unique for each combination of arguments passed to the function.