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2.53 kB
| diff --git a/Doc/library/dis.rst b/Doc/library/dis.rst | |
| index 296d8a9c66..248743b8fa 100644 | |
| --- a/Doc/library/dis.rst | |
| +++ b/Doc/library/dis.rst | |
| iterations of the loop. | |
| .. versionadded:: 3.12 | |
| +.. opcode:: LOAD_FAST_AND_CLEAR (var_num) | |
| + | |
| + Pushes a reference to the local ``co_varnames[var_num]`` onto the stack (or | |
| + pushes ``NULL`` onto the stack if the local variable has not been | |
| + initialized) and sets ``co_varnames[var_num]`` to ``NULL``. | |
| + | |
| + .. versionadded:: 3.12 | |
| + | |
| .. opcode:: STORE_FAST (var_num) | |
| Stores ``STACK.pop()`` into the local ``co_varnames[var_num]``. | |
| diff --git a/Doc/whatsnew/3.12.rst b/Doc/whatsnew/3.12.rst | |
| index 12d357f117..eb13d4bf03 100644 | |
| --- a/Doc/whatsnew/3.12.rst | |
| +++ b/Doc/whatsnew/3.12.rst | |
| New Features | |
| In Python 3.14, the default will switch to ``'data'``. | |
| (Contributed by Petr Viktorin in :pep:`706`.) | |
| +.. _whatsnew312-pep709: | |
| + | |
| +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. | |
| + | |
| +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 | |
| +comprehension. This isolation is now maintained via stack/locals manipulation, | |
| +not via separate function scope. | |
| + | |
| +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. | |
| +* Calling :func:`locals` inside a comprehension now includes variables | |
| + from outside the comprehension, and no longer includes the synthetic ``.0`` | |
| + variable for the comprehension "argument". | |
| + | |
| +Contributed by Carl Meyer and Vladimir Matveev in :pep:`709`. | |
| + | |
| PEP 688: Making the buffer protocol accessible in Python | |
| -------------------------------------------------------- | |
| diff --git a/Misc/NEWS.d/next/Core and Builtins/2023-01-30-15-40-29.gh-issue-97933.nUlp3r.rst b/Misc/NEWS.d/next/Core and Builtins/2023-01-30-15-40-29.gh-issue-97933.nUlp3r.rst | |
| new file mode 100644 | |
| index 0000000000..2eec05cb3a | |
| --- /dev/null | |
| +++ b/Misc/NEWS.d/next/Core and Builtins/2023-01-30-15-40-29.gh-issue-97933.nUlp3r.rst | |
| +:pep:`709`: inline list, dict and set comprehensions to improve performance | |
| +and reduce bytecode size. | |