cache_disk.py

def cache_disk(seconds = 900, cache_folder="/tmp"):
    def doCache(f):
        def inner_function(*args, **kwargs):

            # calculate a cache key based on the decorated method signature
            key = sha1(str(f.__module__) + str(f.__name__) + str(args) + str(kwargs)).hexdigest()
            filepath = os.path.join(cache_folder, key)

            # verify that the cached object exists and is less than $seconds old
            if os.path.exists(filepath):
                modified = os.path.getmtime(filepath)
                age_seconds = time.time() - modified
                if age_seconds < seconds:
                    return pickle.load(open(filepath, "rb"))

            # call the decorated function...
            result = f(*args, **kwargs)

            # ... and save the cached object for next time
            pickle.dump(result, open(filepath, "wb"))

            return result
        return inner_function
    return doCache