usr bin env python def memoize function cached def wrapper if not in c

#!/usr/bin/env python

def memoize(function, cached={}):
    def wrapper(x, y):
        if (x, y) not in cached:
            cached[(x, y)] = function(x, y)
        return cached[(x, y)]
    return wrapper

class Memoization(object):
    def __init__(self, function):
        self.function = function
        self.cached = {}
    
    def __call__(self, x, y):
        if (x, y) not in self.cached:
            self.cached[(x, y)] = self.function(x, y)
        return self.cached[(x, y)]

@memoize
def add(a, b):
    print "%s + %s" % (a, b)
    return a + b

@Memoization
def rem(c, d):
    print "%s - %s" % (c, d)
    return c - d

print add(1, 3)
print add(1, 4)
print add(1, 3)
print rem(1, 3)
print rem(1, 4)
print rem(1, 3)