aiocache

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Is it possible to implement cache expiration events on this lib? If it is can I have an example?

Do you mean a callback when a cached item expires?

If so, I think that would depend entirely on the backend. e.g. The SimpleMemoryBackend just schedules a function call later (https://github.com/aio-libs/aiocache/blob/master/aiocache/backends/memory.py#L37). So, by subclassing it, you could figure out a way to get a notification. But, if you use a memcached backend, then the expiration happens in memcached, so you'd need to figure out a way to get the information from there.