Re: Migrating to BTrees 4.x

On Sun, Nov 20, 2016 at 12:11 PM, Jason Madden <[email protected]
> wrote:

>
> > On Nov 20, 2016, at 10:25, Jim Fulton <[email protected]> wrote:
> >
> >> But it seems safe to say there are at least some discrepancies and some
> clear bugs in the handling of unorderable objects still.
> >
> > Yup.  Partly I suspect this is the related to the many ways one can
> express comparison in Python. (Talk about more than one way to do it.)
> >
> > I think this may also be related to inserting into an empty BTree, where
> there's noting to compare the new item to and thus no opportunity to fail.
> Perhaps, if we're paranoid, we should compare the first item to itself on
> insert.
>
> You're right, under Python 3, this only happens in an empty tree. Once
> there are other items, you get "TypeError: unorderable types: Bad() < ..."
> errors. Under Python 2, of course, no such luck.
>
> > In any case, I think the focus for this seat belt should be on insertion.
>
> I've opened a series of issues in the repository (
> https://github.com/zopefoundation/BTrees/issues) that I think capture the
> discussion here.


Thanks.


> I may be able to come up with some PRs over the next week for them.
>

It looks like David was going to try a fix. David, did this discussion help?

Jim

-- 
Jim Fulton
http://jimfulton.info

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