Created
September 30, 2013 03:57
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Use decorate to maintain a memory cache.
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| #-*-coding:utf-8-*- | |
| """ | |
| Use decorate to maintain a memory cache. | |
| """ | |
| def cache_c(fn): | |
| cache = {} | |
| miss = None | |
| def wrapper(*args, **kwargs): | |
| result = cache.get(args, miss) | |
| if result is miss: | |
| result = fn(*args, **kwargs) | |
| cache[args] = result | |
| return result | |
| return wrapper | |
| @cache_c | |
| def fib_cache(n): | |
| if n < 2: | |
| return n | |
| return fib_cache(n-1) + fib_cache(n-2) | |
| def fib_uncache(n): | |
| if n < 2: | |
| return n | |
| return fib_uncache(n-1) + fib_uncache(n-2) | |
| def test(): | |
| n = 30 | |
| import time | |
| begin = time.time() | |
| fib_cache(n) | |
| end = time.time() | |
| print("cost time:%f" % (end - begin)) | |
| begin = time.time() | |
| fib_uncache(n) | |
| end = time.time() | |
| print("cost time:%f" % (end - begin)) | |
| if __name__ == '__main__': | |
| test() |
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