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Mention how requiring ordered dicts breaks backwards-compatibility.

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Brett Cannon 2016-09-09 11:18:21 -07:00
parent feea6e7bcf
commit 6760c69022
1 changed files with 3 additions and 1 deletions
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@ -422,7 +422,9 @@ Some smaller changes made to the core Python language are:
to have this new dict implementation in the language for a few
releases before changing the language spec to mandate
order-preserving semantics for all current and future Python
implementations).
implementations; this also helps preserve backwards-compatibility
with older versions of the language where random iteration order is
still in effect, e.g. Python 3.5).
(Contributed by INADA Naoki in :issue:`27350`. Idea
`originally suggested by Raymond Hettinger
<https://mail.python.org/pipermail/python-dev/2012-December/123028.html>`_.)