read CAREFULLY http://web2py.com/books/default/chapter/29/04/the-core#cache 
.

Unfortunately (?) web2py's cache isn't "the usual" cache object, as it's 
designed to store indefinitely values that do not expire automatically. 
Basically time_expire vouches to either fetch the stored value or to update 
the one already in cache.

time_expire=None forces the retrieval of the stored value, without updating 
it, so you MAY use it for your usecase.

NB: The redis backend needs to adhere to the same API web2py has, but 
leverages redis evictions postponing a bit the real expiration.


On Wednesday, November 16, 2016 at 2:53:52 PM UTC+1, Pierre wrote:
>
> how do I retrieve a key,value pair stored in the redis cache ?
>
> am doing this :
>
> message = cache.redis('message', lambda: 'Hello', time_expire=360)
>
>
> now i want to test that key='message' still exists and get its value ?
>

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