Is there a Python caching library?

From Python 3.2 you can use the decorator @lru_cache from the functools library.
It’s a Least Recently Used cache, so there is no expiration time for the items in it, but as a fast hack it’s very useful.

from functools import lru_cache

@lru_cache(maxsize=256)
def f(x):
  return x*x

for x in range(20):
  print f(x)
for x in range(20):
  print f(x)