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authorBrett Cannon <brett@python.org>2016-09-09 18:18:21 (GMT)
committerBrett Cannon <brett@python.org>2016-09-09 18:18:21 (GMT)
commit6760c690227cc915c5e721c0e5b1a0ba9a94e20e (patch)
tree4c8fbc3df062791f9c61ba30e91193c98380c179 /Doc
parentfeea6e7bcf1735486a0a53c534b3680e884a8ec6 (diff)
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Mention how requiring ordered dicts breaks backwards-compatibility.
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-rw-r--r--Doc/whatsnew/3.6.rst4
1 files changed, 3 insertions, 1 deletions
diff --git a/Doc/whatsnew/3.6.rst b/Doc/whatsnew/3.6.rst
index a150d9d..e14125a 100644
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+++ b/Doc/whatsnew/3.6.rst
@@ -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>`_.)