Log message:
python39: updated to 3.9.1

Python 3.9.1 final

Core and Builtins

bpo-42576: types.GenericAlias will now raise a TypeError when attempting to \ 
initialize with a keyword argument. Previously, this would cause the interpreter \ 
to crash if the interpreter was compiled with debug symbols. This does not \ 
affect interpreters compiled for release. Patch by Ken Jin.

Library

bpo-5054: CGIHTTPRequestHandler.run_cgi() HTTP_ACCEPT improperly parsed. Replace \ 
the special purpose getallmatchingheaders with generic get_all method and add \ 
relevant tests.
bpo-17735: inspect.findsource() now raises OSError instead of IndexError when \ 
co_lineno of a code object is greater than the file length. This can happen, for \ 
example, when a file is edited after it was imported.
bpo-42116: Fix handling of trailing comments by inspect.getsource().
bpo-42487: ChainMap.__iter__ no longer calls __getitem__ on underlying maps
bpo-42482: TracebackException no longer holds a reference to the exception’s \ 
traceback object. Consequently, instances of TracebackException for equivalent \ 
but non-equal exceptions now compare as equal.
bpo-42406: We fixed an issue in pickle.whichmodule in which importing \ 
multiprocessing could change the how pickle identifies which module an object \ 
belongs to, potentially breaking the unpickling of those objects.
bpo-34215: Clarify the error message for asyncio.IncompleteReadError when \ 
expected is None.
bpo-12800: Extracting a symlink from a tarball should succeed and overwrite the \ 
symlink if it already exists. The fix is to remove the existing file or symlink \ 
before extraction. Based on patch by Chris AtLee, Jeffrey Kintscher, and Senthil \ 
Kumaran.

Tests

bpo-41473: Reenable test_gdb on gdb 9.2 and newer: \ 
https://bugzilla.redhat.com/show_bug.cgi?id=1866884 bug is fixed in gdb 10.1.
bpo-42553: Fix test_asyncio.test_call_later() race condition: don’t measure \ 
asyncio performance in the call_later() unit test. The test failed randomly on \ 
the CI.

macOS

bpo-41116: If no explicit macOS SDK was specified, setup.py should check for Tcl \ 
and TK frameworks in /Library/Frameworks; the previous commit inadvertently \ 
broke that test.
bpo-42504: Fix build on macOS Big Sur when MACOSX_DEPLOYMENT_TARGET=11

IDLE

bpo-42508: Keep IDLE running on macOS. Remove obsolete workaround that prevented \ 
running files with shortcuts when using new universal2 installers built on macOS \ 
11.

Log message:
python39: added version 3.9.0

3.9.0 Release highlights

New syntax features:

PEP 584, union operators added to dict;
PEP 585, type hinting generics in standard collections;
PEP 614, relaxed grammar restrictions on decorators.

New built-in features:

PEP 616, string methods to remove prefixes and suffixes.

New features in the standard library:

PEP 593, flexible function and variable annotations;
os.pidfd_open() added that allows process management without races and signals.

Interpreter improvements:

PEP 573, fast access to module state from methods of C extension types;
PEP 617, CPython now uses a new parser based on PEG;
a number of Python builtins (range, tuple, set, frozenset, list, dict) are now \ 
sped up using PEP 590 vectorcall;
garbage collection does not block on resurrected objects;
a number of Python modules (_abc, audioop, _bz2, _codecs, _contextvars, _crypt, \ 
_functools, _json, _locale, math, operator, resource, time, _weakref) now use \ 
multiphase initialization as defined by PEP 489;
a number of standard library modules (audioop, ast, grp, _hashlib, pwd, \ 
_posixsubprocess, random, select, struct, termios, zlib) are now using the \ 
stable ABI defined by PEP 384.

New library modules:

PEP 615, the IANA Time Zone Database is now present in the standard library in \ 
the zoneinfo module;
an implementation of a topological sort of a graph is now provided in the new \ 
graphlib module.

Release process changes:

PEP 602, CPython adopts an annual release cycle.