utils.py 文件源码

def memoized(func):
    """A decorator to cache function's return value

    """
    cache = {}

    @functools.wraps(func)
    def wrapper(*args):
        if not isinstance(args, collections.Hashable):
            # args is not cacheable. just call the function.
            return func(*args)
        if args in cache:
            return cache[args]
        else:
            value = func(*args)
            cache[args] = value
            return value
    return wrapper