From: Pablo Galindo Date: Tue, 25 Jun 2019 01:41:58 +0000 (+0100) Subject: bpo-35224: Add What's new entry for evaluation order in dict comprehensions (GH-14319) X-Git-Tag: v3.9.0a1~1180 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=b51b7137faa22e12c570c70fe0462c662ccd935e;p=thirdparty%2FPython%2Fcpython.git bpo-35224: Add What's new entry for evaluation order in dict comprehensions (GH-14319) --- diff --git a/Doc/whatsnew/3.8.rst b/Doc/whatsnew/3.8.rst index 1081ef21df13..1177c82f42c9 100644 --- a/Doc/whatsnew/3.8.rst +++ b/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 =========== @@ -1502,6 +1505,11 @@ 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 ---------------