hacky_cache

def hacky_cache(fn):
    def caching_runner():
        cache_file = '{}.pickle'.format(fn.__name__)
        if os.path.exists(cache_file):
            with open(cache_file) as f:
                return pickle.load(f)
        else:
            result = fn()
            with open(cache_file, 'wb') as f:
                pickle.dump(result, f)
            return result
    return caching_runner