8000 gh-104374: don't inline comprehensions in non-function scopes by carljm · Pull Request #104519 · python/cpython · GitHub
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gh-104374: don't inline comprehensions in non-function scopes #104519

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gh-104374: don't inline comprehensions in non-function scopes #104519

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gh-104374: don't inline comprehensions in non-function scopes
carljm May 16, 2023
2c47a75
update NEWS and What's New
carljm May 16, 2023
b1bb3a7
Merge branch 'main' into 709funconly
carljm May 17, 2023
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update NEWS and What's New
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@carljm
carljm committed May 16, 2023
commit 2c47a7551dd67263cce189ef4017463c914f19e9
7 changes: 4 additions & 3 deletions Doc/whatsnew/3.12.rst
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Expand Up @@ -158,9 +158,10 @@ New Features
PEP 709: Comprehension inlining
-------------------------------

Dictionary, list, and set comprehensions are now inlined, rather than creating a
new single-use function object for each execution of the comprehension. This
speeds up execution of a comprehension by up to 2x.
Dictionary, list, and set comprehensions occurring inside functions are now
inlined, rather than creating a new single-use function object for each
execution of the comprehension. This speeds up execution of a comprehension by
up to 2x.

Comprehension iteration variables remain isolated; they don't overwrite a
variable of the same name in the outer scope, nor are they visible after the
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4 changes: 2 additions & 2 deletions Misc/NEWS.d/next/Core and Builtins/2023-01-30-15-40-29.gh-issue-97933.nUlp3r.rst
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@@ -1,2 +1,2 @@
:pep:`709`: inline list, dict and set comprehensions to improve performance
and reduce bytecode size.
:pep:`709`: inline list, dict and set comprehensions in functions to improve
performance and reduce bytecode size.
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