joblib caching for expensive functions

caching.py

import joblib
import os

cachedir = 'cache'
if not os.path.isdir(cachedir): os.mkdir(cachedir)
mem = joblib.Memory(cachedir=cachedir, verbose=True)

@mem.cache
def my_long_function(i):
	return i + i

# first call is done normally
print my_long_function(1)
# second call is loaded from cache directory
print my_long_function(1)