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| -rw-r--r-- | Doc/whatsnew/3.12.rst | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/Doc/whatsnew/3.12.rst b/Doc/whatsnew/3.12.rst index 3bd9081..7f024f6 100644 --- a/Doc/whatsnew/3.12.rst +++ b/Doc/whatsnew/3.12.rst @@ -247,14 +247,12 @@ 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. +speeds up execution of a comprehension by up to two times. +See :pep:`709` for further details. -Comprehension iteration variables remain isolated; they don't overwrite a +Comprehension iteration variables remain isolated and don't overwrite a variable of the same name in the outer scope, nor are they visible after the -comprehension. This isolation is now maintained via stack/locals manipulation, -not via separate function scope. - -Inlining does result in a few visible behavior changes: +comprehension. Inlining does result in a few visible behavior changes: * There is no longer a separate frame for the comprehension in tracebacks, and tracing/profiling no longer shows the comprehension as a function call. @@ -271,7 +269,7 @@ Inlining does result in a few visible behavior changes: create a list of keys to iterate over: ``keys = list(locals()); [k for k in keys]``. -Contributed by Carl Meyer and Vladimir Matveev in :pep:`709`. +(Contributed by Carl Meyer and Vladimir Matveev in :pep:`709`.) .. _whatsnew312-pep688: |