def debugit(func):
    def func2(*x):
        print " in f(x,y,...); args={}".format(x)
        return func(*x)
    return func2

@debugit
def f(x, y):
    return x + y

def f1(x):
    # without memoization
    return x+1

f2_cache = {}
def f2(x):
    # with memoization
    if x in f2_cache:
        return f2_cache[x]
    else:
        answer = x+1
        f2_cache[x] = answer
        return answer


def main():
    a = f(3, 4)
    print "f(3,4)= {}".format(a)

main()