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bpo-35224: Add What's new entry for evaluation order in dict comprehe…

…nsions (GH-14319)

(cherry picked from commit b51b713)

Co-authored-by: Pablo Galindo <>
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miss-islington and pablogsal committed Jun 25, 2019
1 parent dad8f79 commit ced9e11931a7a1c5cf4eef08d0dd4a4886723b43
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  1. +8 −0 Doc/whatsnew/3.8.rst
@@ -349,6 +349,9 @@ Other Language Changes
is ``-1``, and a suitable power of that inverse for other negative exponents.
(Contributed by Mark Dickinson in :issue:`36027`.)

* When dictionary comprehensions are evaluated, the key is now evaluated before
the value, as proposed by :pep:`572`.

New Modules
@@ -1499,6 +1502,11 @@ CPython bytecode changes
when awaiting a next item in an :keyword:`async for` loop.
(Contributed by Serhiy Storchaka in :issue:`33041`.)

* The :opcode:`MAP_ADD` now expects the value as the first element in the
stack and the key as the second element. This change was made so the key
is always evaluated before the value in dictionary comprehensions, as
porposed by :pep:`572`. (Contributed by Jörn Heissler in :issue:`35224`.)

Demos and Tools

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