gistfile1.txt

def memoize(function):

    def wrapper(*args, **kwargs):
        key = (args, frozenset(kwargs.items()))
        instance = args[0]
        if not hasattr(instance, '__cache'):
            instance.__cache = {}
        if key not in instance.__cache:
            instance.__cache[key] = function(*args, **kwargs)
        return instance.__cache[key]
    return wrapper