Log Message:
python39: updated to 3.9.6

Python 3.9.6 final

Security

bpo-44022: mod:http.client now avoids infinitely reading potential HTTP headers \ 
after a 100 Continue status response from the server.
Core and Builtins
bpo-44409: Fix error location information for tokenizer errors raised on \ 
initialization of the tokenizer. Patch by Pablo Galindo.
bpo-43667: Improve Unicode support in non-UTF locales on Oracle Solaris. This \ 
issue does not affect other Solaris systems.
bpo-44168: Fix error message in the parser involving keyword arguments with \ 
invalid expressions. Patch by Pablo Galindo
bpo-44114: Fix incorrect dictkeys_reversed and dictitems_reversed function \ 
signatures in C code, which broke webassembly builds.
bpo-44070: No longer eagerly makes import filenames absolute, except for \ 
extension modules, which was introduced in 3.9.5.
bpo-28146: Fix a confusing error message in str.format().
bpo-11105: When compiling ast.AST objects with recursive references through \ 
compile(), the interpreter doesn’t crash anymore instead it raises a \ 
RecursionError.

Library

bpo-44516: Update vendored pip to 21.1.3
bpo-44482: Fix very unlikely resource leak in glob in alternate Python \ 
implementations.
bpo-44439: Fix in bz2.BZ2File.write() / lzma.LZMAFile.write() methods, when the \ 
input data is an object that supports the buffer protocol, the file length may \ 
be wrong.
bpo-44434: _thread.start_new_thread() no longer calls PyThread_exit_thread() \ 
explicitly at the thread exit, the call was redundant. On Linux with the glibc, \ 
pthread_exit() aborts the whole process if dlopen() fails to open libgcc_s.so \ 
file (ex: EMFILE error). Patch by Victor Stinner.
bpo-44422: The threading.enumerate() function now uses a reentrant lock to \ 
prevent a hang on reentrant call. Patch by Victor Stinner.
bpo-44395: Fix as_string() to pass unixfrom properly. Patch by Dong-hee Na.
bpo-44342: [Enum] Be more robust in searching for pickle support before making \ 
an enum class unpicklable.
bpo-44356: [Enum] Allow multiple data-type mixins if they are all the same.
bpo-44254: On Mac, give turtledemo button text a color that works on both light \ 
or dark background. Programmers cannot control the latter.
bpo-44145: hmac computations were not releasing the GIL while calling the \ 
OpenSSL HMAC_Update C API (a new feature in 3.9). This unintentionally prevented \ 
parallel computation as other hashlib algorithms support.
bpo-37788: Fix a reference leak when a Thread object is never joined.
bpo-44061: Fix regression in previous release when calling \ 
pkgutil.iter_modules() with a list of pathlib.Path objects
bpo-36515: The hashlib module no longer does unaligned memory accesses when \ 
compiled for ARM platforms.
bpo-44018: random.seed() no longer mutates bytearray inputs.
bpo-38352: Add IO, BinaryIO, TextIO, Match, and Pattern to typing.__all__. Patch \ 
by Jelle Zijlstra.
bpo-43972: When http.server.SimpleHTTPRequestHandler sends a 301 (Moved \ 
Permanently) for a directory path not ending with /, add a Content-Length: 0 \ 
header. This improves the behavior for certain clients.
bpo-28528: Fix a bug in pdb where checkline() raises AttributeError if it is \ 
called after reset().
bpo-43776: When subprocess.Popen args are provided as a string or as \ 
pathlib.Path, the Popen instance repr now shows the right thing.
bpo-43666: AIX: Lib/_aix_support.get_platform() may fail in an AIX WPAR. The \ 
fileset bos.rte appears to have a builddate in both LPAR and WPAR so this \ 
fileset is queried rather than bos.mp64. To prevent a similiar situation (no \ 
builddate in ODM) a value (9988) sufficient for completing a build is provided. \ 
Patch by M Felt.
bpo-43650: Fix MemoryError in shutil.unpack_archive() which fails inside \ 
shutil._unpack_zipfile() on large files. Patch by Igor Bolshakov.
bpo-43318: Fix a bug where pdb does not always echo cleared breakpoints.
bpo-43295: datetime.datetime.strptime() now raises ValueError instead of \ 
IndexError when matching 'z' with the %z format specifier.
bpo-37022: pdb now displays exceptions from repr() with its p and pp commands.
Documentation
bpo-40620: Convert examples in tutorial controlflow.rst section 4.3 to be \ 
interpreter-demo style.
bpo-13814: In the Design FAQ, answer “Why don’t generators support the with \ 
statement?”
bpo-44392: Added a new section in the C API documentation for types used in type \ 
hinting. Documented Py_GenericAlias and Py_GenericAliasType.
bpo-38291: Mark typing.io and typing.re as deprecated since Python 3.8 in the \ 
documentation. They were never properly supported by type checkers.
bpo-44322: Document that SyntaxError args have a details tuple and that details \ 
are adjusted for errors in f-string field replacement expressions.
bpo-44195: Corrected references to TraversableResources in docs. There is no \ 
TraversableReader.
bpo-41963: Document that ConfigParser strips off comments when reading \ 
configuration files.
bpo-44072: Correct where in the numeric ABC hierarchy ** support is added, i.e., \ 
in numbers.Complex, not numbers.Integral.
bpo-43558: Add the remark to dataclasses documentation that the __init__() of \ 
any base class has to be called in __post_init__(), along with a code example.
bpo-41621: Document that collections.defaultdict parameter default_factory \ 
defaults to None and is positional-only.

Tests

bpo-44287: Fix asyncio test_popen() of test_windows_utils by using a longer \ 
timeout. Use military grade battle-tested test.support.SHORT_TIMEOUT timeout \ 
rather than a hardcoded timeout of 10 seconds: it’s 30 seconds by default, but \ 
it is made longer on slow buildbots. Patch by Victor Stinner.
bpo-44363: Account for address sanitizer in test_capi. test_capi now passes when \ 
run GCC address sanitizer.

Build

bpo-44381: The Windows build now accepts EnableControlFlowGuard set to guard to \ 
enable CFG.
Windows
bpo-41299: Fix 16ms jitter when using timeouts in threading, such as with \ 
threading.Lock.acquire() or threading.Condition.wait().

macOS

bpo-43568: Relax unnecessarily restrictive MACOSX_DEPLOYMENT_TARGET check when \ 
building extension modules for macOS. Patch by Joshua Root.
bpo-43109: Allow –with-lto configure option to work with Apple-supplied Xcode \ 
or Command Line Tools.

IDLE

bpo-40128: Mostly fix completions on macOS when not using tcl/tk 8.6.11 (as with \ 
3.9). The added update_idletask call should be harmless and possibly helpful \ 
otherwise.
bpo-33962: Move the indent space setting from the Font tab to the new Windows \ 
tab. Patch by Mark Roseman and Terry Jan Reedy.
bpo-40468: Split the settings dialog General tab into Windows and Shell/ED tabs. \ 
Move help sources, which extend the Help menu, to the Extensions tab. Make space \ 
for new options and shorten the dialog. The latter makes the dialog better fit \ 
small screens.
bpo-41611: Avoid uncaught exceptions in AutoCompleteWindow.winconfig_event().
bpo-41611: Fix IDLE sometimes freezing upon tab-completion on macOS.

Tools/Demos

bpo-44074: Make patchcheck automatically detect the correct base branch name \ 
(previously it was hardcoded to ‘master’)

C API

bpo-44441: Py_RunMain() now resets PyImport_Inittab to its initial value at \ 
exit. It must be possible to call PyImport_AppendInittab() or \ 
PyImport_ExtendInittab() at each Python initialization. Patch by Victor Stinner.
bpo-42083: Fix crash in PyStructSequence_NewType() when passed NULL in the \ 
documentation string slot.