Serhiy Storchaka added the comment:

In issue28014 __getitem__() is idempotent. Multiple calls of __getitem__() 
return the same result and keep the OrderedDict in the same state.

> I'd be perfectly happy with making popitem implemented in terms of pop on 
> subclasses when pop is overridden (if pop isn't overridden though, that's 
> effectively what popitem already does).

I like this idea.

> Note: In the expiring case, the fix is still "wrong" if someone used popitem 
> for the intended purpose (to get and delete).

Good catch! But old implementation still looks doubtful to me.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27275>
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