memoize class for memorizing / caching function calls in python along with reset and reset all memoized functions

memoize.py

import collections
import functools

memoized = []


def clearAllMemoized():
    [m.reset() for m in memoized]


class memoize(object):

    '''Decorator. Caches a function's return value each time it is called.
    If called later with the same arguments, the cached value is returned
    (not reevaluated).
    '''

    def __init__(self, func):
        self.func = func
        self.cache = {}
        memoized.append(self)

    def __call__(self, *args):
        if not isinstance(args, collections.Hashable):
            # uncacheable. a list, for instance.
            # better to not cache than blow up.
            return self.func(*args)
        if args in self.cache:
            return self.cache[args]
        else:
            value = self.func(*args)
            self.cache[args] = value
            return value

    def __repr__(self):
        '''Return the function's docstring.'''
        return self.func.__doc__

    def __get__(self, obj, objtype):
        '''Support instance methods.'''
        return functools.partial(self.__call__, obj)

    def reset(self):
        self.cache = {}

wrong, since isinstance(args, collections.Hashable) will always be True