Message 215746 - Python tracker

Message215746

Author	akira
Recipients	akira, pitrou, r.david.murray
Date	2014-04-08.09:05:30
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1396947931.09.0.571136039508.issue21041@psf.upfronthosting.co.za>
In-reply-to

Content
From https://docs.python.org/3/glossary.html#term-sequence > An iterable which supports efficient element access using integer indices via the __getitem__() special method and defines a __len__() method that returns the length of the sequence. .parents is a sequence. And it is confusing that it doesn't accept negative indexes -- that is how I've encountered the bug. Antoine, could you elaborate on what are the negative consequences of negative indexes to justify breaking the expectations?

Content

From https://docs.python.org/3/glossary.html#term-sequence

> An iterable which supports efficient element access using integer indices via the __getitem__() special method and defines a __len__() method that returns the length of the sequence.

.parents *is* a sequence. And it *is* confusing that it doesn't accept negative indexes -- that is how I've encountered the bug.

Antoine, could you elaborate on what are the negative consequences of negative indexes to justify breaking the expectations?

History
Date	User	Action	Args
2014-04-08 09:05:31	akira	set	recipients: + akira, pitrou, r.david.murray
2014-04-08 09:05:31	akira	set	messageid: <1396947931.09.0.571136039508.issue21041@psf.upfronthosting.co.za>
2014-04-08 09:05:31	akira	link	issue21041 messages
2014-04-08 09:05:30	akira	create