[Python-ideas] Reversable

[Paul Moore]

On 28 April 2010 11:48, cool-RR <cool-rr at cool-rr.com> wrote:
> Does anyone else care to express their opinion about the Reversable
> suggestion?

I think you need some more convincing use cases, and a better
explanation of how you'd see it working. As things stand, it sounds
like you're just suggesting it for completeness' sake. I assume you're
expecting an implementation which checks if the type is an instance of
Sequence or has a callable attribute __reversed__?

Then again, I'm not a great user of ABCs in any case - easier to ask
forgiveness and all that, I'd tend to just use reversed() and be
prepared to deal with an error if the caller passed something
non-reversible (maybe just by expecting the caller to deal with the
exception, because they didn't satisfy the input requirements).

Paul.