Python · functools and standard library

functools.lru_cache()

Caches a function’s results by arguments. Use it for pure, expensive functions.

pythonRunnable example python course

Syntax

lru_cache(maxsize=None)

Example

Open in the lab

from functools import lru_cache
@lru_cache(maxsize=None)
def square(n): return n * n
print(square(9), square(9))

Reference pages are the quick answer. The course explains the why, shows the full example and ends with a challenge.