Closures in Python

Question

I\'ve been trying to learn Python, and while I\'m enthusiastic about using closures in Python, I\'ve been having trouble getting some code to work properly:

Answer 1

Probably because you want the global get while it isn't a global? By the way, apply is deprecated, use fn(*args) instead.

def memoize(fn):
    def get(key):
        return (False,)

    def vset(key, value):
        def newget(ky):
            if key==ky: return (True, value)
            return get(ky)
        get = newget

    def mfun(*args):
        cache = get(args)
        if (cache[0]): return cache[1]

        val = fn(*args)
        vset(args, val)
        return val

    return mfun

def fib(x):
    if x<2: return x
    return fib(x-1)+fib(x-2)

def fibm(x):
    if x<2: return x
    return fibm(x-1)+fibm(x-2)

fibm = memoize(fibm)