cache.py

from functools import wraps


def memoize(func):
    cache = {}

    @wraps(func)
    def wrapper(*args, **kwargs):
        key = args + tuple(kwargs.items())
        if key not in cache:
            cache[key] = func(*args, **kwargs)

        return cache[key]

    return wrapper


def cached_property(func):
    @property
    @wraps(func)
    def wrapper(self):
        if not hasattr(self, '__property_cache__'):
            self.__property_cache__ = {}

        if func.__name__ not in self.__property_cache__:
            self.__property_cache__[func.__name__] = func(self)

        return self.__property_cache__[func.__name__]

    return wrapper