On 30 Apr 2009, at 20:22, Scott David Daniels wrote:
Steven D'Aprano wrote:
Here's a quick&dirty but working solution. (Tested under Python 2.5.) def once(func): class Cache(object): def __call__(self, *args, **kwargs): try: return self._value except AttributeError: result = func(*args, **kwargs) self._value = result return result def expire(self): del self._value return Cache()
This is slightly better (name change as in Antoine Pitrou's comment):
class cached(object):
def __init__(self, function): self._function = function self._cache = {}
def __call__(self, *args): try: return self._cache[args] except KeyError: self._cache[args] = self._function(*args) return self._cache[args]
def expire(self, *args): del self._cache[args]
You're going to run into trouble with unhashable args. -- Arnaud