question: diff between exception.ignore and contextlib.suppress about pydu

[Cologler]

misc.memoize 和 functools.lru_cache 也很相似。有什么优点吗？

[Prodesire]

Well, I reimplement exception.ignore, so that it is same to contextlib.suppress on Python 3. But on Python 2, exception.ignore is still implement by self due to there is not contextlib.suppress.

[Prodesire]

misc.memoize aims to cache a value returned by method, so that when we use the method next time, it will just return the cached value.

Meanwhile, functools.lru_cache aims to cache least recently used value using LRU algorithm. See wiki. If we don't use the value frequently, the cache will be gone. And when we call the method next time, it will re-calculate because of no cache value exists.

[Cologler]

但 lru_cache 可以设置缓存大小啊，只要设置为 None 就不会抛弃过去的值了。

[Prodesire]

设置为 None 确实能达到效果，但这就有点类似于“杀鸡用牛刀”的感觉。之所以有 msc.memoize 是处于这样的考量：

• functools.lru_cache 在Python 3中才有，在Python 2中需额外实现
• 针对单纯缓存函数调用结果来说，LRU算法尽管能解决问题，但大材小用了，显得有些复杂