Fibonacci example with decorators

#!/usr/bin/bash python
from functools import wraps

def memoize(obj):
    """Function wrapper for memorizing stuff."""
    cache = {}

    @wraps(obj)
    def memoizer(*args, **kwargs):
        """Actual memorizer."""
        if args not in cache:
            cache[args] = obj(*args, **kwargs)
        return cache[args]
    return memoizer

@memoize
def fib(n):
    """Return the fibonacci sequence."""
    if n < 2:
        return n
    else:
        return fib(n-1) + fib(n-2)