diff options
Diffstat (limited to 'Doc')
| -rw-r--r-- | Doc/library/dis.rst | 8 | ||||
| -rw-r--r-- | Doc/whatsnew/3.12.rst | 24 |
2 files changed, 32 insertions, 0 deletions
diff --git a/Doc/library/dis.rst b/Doc/library/dis.rst index 296d8a9..248743b 100644 --- a/Doc/library/dis.rst +++ b/Doc/library/dis.rst @@ -1196,6 +1196,14 @@ 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 12d357f..eb13d4b 100644 --- a/Doc/whatsnew/3.12.rst +++ b/Doc/whatsnew/3.12.rst @@ -153,6 +153,30 @@ 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 -------------------------------------------------------- |