Python懒人便携版本

+++++++++++ Python News +++++++++++ What's New in Python 3.12.0 final? ================================== *Release date: 2023-10-02* Core and Builtins ----------------- - gh-issue-109823: Fix bug where compiler does not adjust labels when removing an empty basic block which is a jump target. - gh-issue-109719: Fix missing jump target labels when compiler reorders cold/warm blocks. - gh-issue-109627: Fix bug where the compiler does not assign a new jump target label to a duplicated small exit block. Library ------- - gh-issue-110045: Update the :mod:`symtable` module to support the new scopes introduced by :pep:`695`. Documentation ------------- - gh-issue-109209: The minimum Sphinx version required for the documentation is now 4.2. Windows ------- - gh-issue-109991: Update Windows build to use OpenSSL 3.0.11. macOS ----- - gh-issue-109991: Update macOS installer to use OpenSSL 3.0.11. Tools/Demos ----------- - gh-issue-109991: Update GitHub CI workflows to use OpenSSL 3.0.11 and multissltests to use 1.1.1w, 3.0.11, and 3.1.3. What's New in Python 3.12.0 release candidate 3? ================================================ *Release date: 2023-09-18* Core and Builtins ----------------- - gh-issue-109496: On a Python built in debug mode, :c:func:`Py_DECREF()` now calls ``_Py_NegativeRefcount()`` if the object is a dangling pointer to deallocated memory: memory filled with ``0xDD`` "dead byte" by the debug hook on memory allocators. The fix is to check the reference count *before* checking for ``_Py_IsImmortal()``. Patch by Victor Stinner. - gh-issue-109371: Deopted instructions correctly for tool initialization and modified the incorrect assertion in instrumentation, when a previous tool already sets INSTRUCTION events - gh-issue-105658: Fix bug where the line trace of an except block ending with a conditional includes an excess event with the line of the conditional expression. - gh-issue-109219: Fix compiling type param scopes that use a name which is also free in an inner scope. - gh-issue-109341: Fix crash when compiling an invalid AST involving a :class:`ast.TypeAlias`. - gh-issue-109195: Fix source location for the ``LOAD_*`` instruction preceding a ``LOAD_SUPER_ATTR`` to load the ``super`` global (or shadowing variable) so that it encompasses only the name ``super`` and not the following parentheses. - gh-issue-109118: Disallow nested scopes (lambdas, generator expressions, and comprehensions) within PEP 695 annotation scopes that are nested within classes. - gh-issue-109114: Relax the detection of the error message for invalid lambdas inside f-strings to not search for arbitrary replacement fields to avoid false positives. Patch by Pablo Galindo - gh-issue-109118: Fix interpreter crash when a NameError is raised inside the type parameters of a generic class. - gh-issue-108976: Fix crash that occurs after de-instrumenting a code object in a monitoring callback. - gh-issue-108732: Make iteration variables of module- and class-scoped comprehensions visible to pdb and other tools that use ``frame.f_locals`` again. - gh-issue-108959: Fix caret placement for error locations for subscript and binary operations that involve non-semantic parentheses and spaces. Patch by Pablo Galindo Library ------- - gh-issue-108682: Enum: require ``names=()`` or ``type=...`` to create an empty enum using the functional syntax. - gh-issue-108843: Fix an issue in :func:`ast.unparse` when unparsing f-strings containing many quote types. Documentation ------------- - gh-issue-102823: Document the return type of ``x // y`` when ``x`` and ``y`` have type :class:`float`. Tests ----- - gh-issue-109396: Fix ``test_socket.test_hmac_sha1()`` in FIPS mode. Use a longer key: FIPS mode requires at least of at least 112 bits. The previous key was only 32 bits. Patch by Victor Stinner. - gh-issue-104736: Fix test_gdb on Python built with LLVM clang 16 on Linux ppc64le (ex: Fedora 38). Search patterns in gdb "bt" command output to detect when gdb fails to retrieve the traceback. For example, skip a test if ``Backtrace stopped: frame did not save the PC`` is found. Patch by Victor Stinner. - gh-issue-109237: Fix ``test_site.test_underpth_basic()`` when the working directory contains at least one non-ASCII character: encode the ``._pth`` file to UTF-8 and enable the UTF-8 Mode to use UTF-8 for the child process stdout. Patch by Victor Stinner. - gh-issue-109230: Fix ``test_pyexpat.test_exception()``: it can now be run from a directory different than Python source code directory. Before, the test failed in this case. Skip the test if Modules/pyexpat.c source is not available. Skip also the test on Python implementations other than CPython. Patch by Victor Stinner. - gh-issue-109015: Fix test_asyncio, test_imaplib and test_socket tests on FreeBSD if the TCP blackhole is enabled (``sysctl net.inet.tcp.blackhole``). Skip the few tests which failed with ``ETIMEDOUT`` which such non standard configuration. Currently, the `FreeBSD GCP image enables TCP and UDP blackhole <https://reviews.freebsd.org/D41751>`_ (``sysctl net.inet.tcp.blackhole=2`` and ``sysctl net.inet.udp.blackhole=1``). Patch by Victor Stinner. - gh-issue-91960: Skip ``test_gdb`` if gdb is unable to retrieve Python frame objects: if a frame is ``<optimized out>``. When Python is built with "clang -Og", gdb can fail to retrive the *frame* parameter of ``_PyEval_EvalFrameDefault()``. In this case, tests like ``py_bt()`` are likely to fail. Without getting access to Python frames, ``python-gdb.py`` is mostly clueless on retrieving the Python traceback. Moreover, ``test_gdb`` is no longer skipped on macOS if Python is built with Clang. Patch by Victor Stinner. - gh-issue-108962: Skip ``test_tempfile.test_flags()`` if ``chflags()`` fails with "OSError: [Errno 45] Operation not supported" (ex: on FreeBSD 13). Patch by Victor Stinner. - gh-issue-108851: Fix ``test_tomllib`` recursion tests for WASI buildbots: reduce the recursion limit and compute the maximum nested array/dict depending on the current available recursion limit. Patch by Victor Stinner. - gh-issue-108851: Add ``get_recursion_available()`` and ``get_recursion_depth()`` functions to the :mod:`test.support` module. Patch by Victor Stinner. - gh-issue-108834: Add ``--fail-rerun option`` option to regrtest: if a test failed when then passed when rerun in verbose mode, exit the process with exit code 2 (error), instead of exit code 0 (success). Patch by Victor Stinner. - gh-issue-108834: Rename regrtest ``--verbose2`` option (``-w``) to ``--rerun``. Keep ``--verbose2`` as a deprecated alias. Patch by Victor Stinner. - gh-issue-108834: When regrtest reruns failed tests in verbose mode (``./python -m test --rerun``), tests are now rerun in fresh worker processes rather than being executed in the main process. If a test does crash or is killed by a timeout, the main process can detect and handle the killed worker process. Tests are rerun in parallel if the ``-jN`` option is used to run tests in parallel. Patch by Victor Stinner. - gh-issue-103186: Suppress and assert expected RuntimeWarnings in test_sys_settrace.py Build ----- - gh-issue-108740: Fix a race condition in ``make regen-all``. The ``deepfreeze.c`` source and files generated by Argument Clinic are now generated or updated before generating "global objects". Previously, some identifiers may miss depending on the order in which these files were generated. Patch by Victor Stinner. What's New in Python 3.12.0 release candidate 2? ================================================ *Release date: 2023-09-05