Memoizes decorated function results, trading memory for performance. Can skip memoization for failed calculation attempts:

@memoize                          # Omitting parentheses is ok
def ip_to_city(ip):
        return request_city_from_slow_service(ip)
    except NotFound:
        return None               # return None and memoize it
    except Timeout:
        raise memoize.skip(CITY)  # return CITY, but don't memoize it

Additionally @memoize exposes its memory for you to manipulate:

# Prefill memory

# Forget everything

Custom key_func could be used to work with unhashable objects, insignificant arguments, etc:

@memoize(key_func=lambda obj, verbose=None: obj.key)
def do_things(obj, verbose=False):
    # ...

As @memoize, but with prefilled memory. Decorated function should return all available arg-value pairs, which should be a dict or a sequence of pairs. Resulting function will raise LookupError for any argument missing in it:

def city_location():
    return {row['city']: row['location'] for row in fetch_city_locations()}

If decorated function has arguments then separate lookuper with its own lookup table is created for each combination of arguments. This can be used to make lookup tables on demand:

def function_lookup(f):
    return {x: f(x) for x in range(100)}

fast_sin = function_lookup(math.sin)
fast_cos = function_lookup(math.cos)

Or load some resources, memoize them and use as a function:

def translate(lang):
    return make_list_of_pairs(load_translation_file(lang))

russian_phrases = map(translate('ru'), english_phrases)

Same as @make_lookuper, but returns None on memory miss.

@cache(timeout, key_func=None)

Caches decorated function results for timeout. It can be either number of seconds or datetime.timedelta:

@cache(60 * 60)
def api_call(query):
    # ...

Cache can be invalidated before timeout with:

api_call.invalidate(query)  # Forget cache for query
api_call.invalidate_all()   # Forget everything

Custom key_func could be used same way as in @memoize:

# Do not use token in cache key
@cache(60 * 60, key_func=lambda query, token=None: query)
def api_call(query, token=None):
    # ...