3.9.0a1 - Cpython — ContextQMD

.. bpo: 38722 .. date: 2019-11-18-16-17-56 .. nonce: x3mECW .. release date: 2019-11-19 .. section: Security

:mod:runpy now uses :meth:io.open_code to open code files. Patch by Jason Killen.

.. bpo: 38622 .. date: 2019-11-14-16-13-23 .. nonce: 3DYkfb .. section: Security

Add additional audit events for the :mod:ctypes module.

.. bpo: 38418 .. date: 2019-10-08-19-29-55 .. nonce: QL7s0- .. section: Security

Fixes audit event for :func:os.system to be named os.system.

.. bpo: 38243 .. date: 2019-09-25-13-21-09 .. nonce: 1pfz24 .. section: Security

Escape the server title of :class:xmlrpc.server.DocXMLRPCServer when rendering the document page as HTML. (Contributed by Donghee Na in :issue:38243.)

.. bpo: 38174 .. date: 2019-09-23-21-02-46 .. nonce: MeWuJd .. section: Security

Update vendorized expat library version to 2.2.8, which resolves :cve:2019-15903.

.. bpo: 37764 .. date: 2019-08-27-01-13-05 .. nonce: qv67PQ .. section: Security

Fixes email._header_value_parser.get_unstructured going into an infinite loop for a specific case in which the email header does not have trailing whitespace, and the case in which it contains an invalid encoded word. Patch by Ashwin Ramaswami.

.. bpo: 37461 .. date: 2019-07-16-08-11-00 .. nonce: 1Ahz7O .. section: Security

Fix an infinite loop when parsing specially crafted email headers. Patch by Abhilash Raj.

.. bpo: 37363 .. date: 2019-07-01-10-31-14 .. nonce: fSjatj .. section: Security

Adds audit events for the range of supported run commands (see :ref:using-on-general).

.. bpo: 37463 .. date: 2019-07-01-08-46-14 .. nonce: 1CHwjE .. section: Security

ssl.match_hostname() no longer accepts IPv4 addresses with additional text after the address and only quad-dotted notation without trailing whitespaces. Some inet_aton() implementations ignore whitespace and all data after whitespace, e.g. '127.0.0.1 whatever'.

.. bpo: 37363 .. date: 2019-06-21-15-58-59 .. nonce: diouyl .. section: Security

Adds audit events for :mod:ensurepip, :mod:ftplib, :mod:glob, :mod:imaplib, :mod:!nntplib, :mod:pdb, :mod:poplib, :mod:shutil, :mod:smtplib, :mod:sqlite3, :mod:subprocess, :mod:!telnetlib, :mod:tempfile and :mod:webbrowser, as well as :func:os.listdir, :func:os.scandir and :func:breakpoint.

.. bpo: 37364 .. date: 2019-06-21-14-42-53 .. nonce: IIRc2s .. section: Security

:func:io.open_code is now used when reading :file:.pth files.

.. bpo: 34631 .. date: 2019-06-17-09-34-25 .. nonce: DBfM4j .. section: Security

Updated OpenSSL to 1.1.1c in Windows installer

.. bpo: 34155 .. date: 2019-05-04-13-33-37 .. nonce: MJll68 .. section: Security

Fix parsing of invalid email addresses with more than one @ (e.g. a@[email protected].) to not return the part before 2nd @ as valid email address. Patch by maxking & jpic.

.. bpo: 38631 .. date: 2019-11-18-17-10-20 .. nonce: tRHaAk .. section: Core and Builtins

Replace Py_FatalError() call with a regular :exc:RuntimeError exception in :meth:float.__getformat__.

.. bpo: 38639 .. date: 2019-10-30-11-31-47 .. nonce: 9-vKtO .. section: Core and Builtins

Optimized :func:math.floor, :func:math.ceil and :func:math.trunc for floats.

.. bpo: 38640 .. date: 2019-10-30-11-25-25 .. nonce: 4sAFh5 .. section: Core and Builtins

Fixed a bug in the compiler that was causing to raise in the presence of break statements and continue statements inside always false while loops. Patch by Pablo Galindo.

.. bpo: 38613 .. date: 2019-10-29-15-44-24 .. nonce: V_R3NC .. section: Core and Builtins

Optimized some set operations (e.g. |, ^, and -) of dict_keys. d.keys() | other was slower than set(d) | other but they are almost same performance for now.

.. bpo: 28029 .. date: 2019-10-29-09-38-54 .. nonce: AmRMEF .. section: Core and Builtins

"".replace("", s, n) now returns s instead of an empty string for all non-zero n. There are similar changes for :class:bytes and :class:bytearray objects.

.. bpo: 38535 .. date: 2019-10-20-12-43-48 .. nonce: ESMkVN .. section: Core and Builtins

Fixed line numbers and column offsets for AST nodes for calls without arguments in decorators.

.. bpo: 38525 .. date: 2019-10-20-00-36-18 .. nonce: Vty1cA .. section: Core and Builtins

Fix a segmentation fault when using reverse iterators of empty dict objects. Patch by Donghee Na and Inada Naoki.

.. bpo: 38465 .. date: 2019-10-19-12-44-13 .. nonce: V1L8c4 .. section: Core and Builtins

:class:bytearray, :class:~array.array and :class:~mmap.mmap objects allow now to export more than 2**31 buffers at a time.

.. bpo: 38469 .. date: 2019-10-13-23-41-38 .. nonce: 9kmuQj .. section: Core and Builtins

Fixed a bug where the scope of named expressions was not being resolved correctly in the presence of the global keyword. Patch by Pablo Galindo.

.. bpo: 38437 .. date: 2019-10-10-20-42-09 .. nonce: z_0mZp .. section: Core and Builtins

Activate the GC_DEBUG macro for debug builds of the interpreter (when Py_DEBUG is set). Patch by Pablo Galindo.

.. bpo: 38379 .. date: 2019-10-10-01-41-02 .. nonce: _q4dhn .. section: Core and Builtins

When the garbage collector makes a collection in which some objects resurrect (they are reachable from outside the isolated cycles after the finalizers have been executed), do not block the collection of all objects that are still unreachable. Patch by Pablo Galindo and Tim Peters.

.. bpo: 38379 .. date: 2019-10-09-16-50-52 .. nonce: oz5qZx .. section: Core and Builtins

When cyclic garbage collection (gc) runs finalizers that resurrect unreachable objects, the current gc run ends, without collecting any cyclic trash. However, the statistics reported by collect() and get_stats() claimed that all cyclic trash found was collected, and that the resurrected objects were collected. Changed the stats to report that none were collected.

.. bpo: 38392 .. date: 2019-10-07-22-51-39 .. nonce: KaXXps .. section: Core and Builtins

In debug mode, :c:func:PyObject_GC_Track now calls tp_traverse() of the object type to ensure that the object is valid: test that objects visited by tp_traverse() are valid.

.. bpo: 38210 .. date: 2019-10-06-15-01-57 .. nonce: Xgc6F_ .. section: Core and Builtins

Remove unnecessary intersection and update set operation in dictview with empty set. (Contributed by Donghee Na in :issue:38210.)

.. bpo: 38402 .. date: 2019-10-05-19-36-16 .. nonce: EZuzgK .. section: Core and Builtins

Check the error from the system's underlying crypt or crypt_r.

.. bpo: 37474 .. date: 2019-10-01-12-46-30 .. nonce: cB3se1 .. section: Core and Builtins

On FreeBSD, Python no longer calls fedisableexcept() at startup to control the floating-point control mode. The call became useless since FreeBSD 6: it became the default mode.

.. bpo: 38006 .. date: 2019-09-30-09-33-21 .. nonce: UYlJum .. section: Core and Builtins

Fix a bug due to the interaction of weakrefs and the cyclic garbage collector. We must clear any weakrefs in garbage in order to prevent their callbacks from executing and causing a crash.

.. bpo: 38317 .. date: 2019-09-30-00-56-21 .. nonce: pmqlIQ .. section: Core and Builtins

Fix warnings options priority: PyConfig.warnoptions has the highest priority, as stated in the :pep:587.

.. bpo: 38310 .. date: 2019-09-28-22-54-25 .. nonce: YDTbEo .. section: Core and Builtins

Predict BUILD_MAP_UNPACK_WITH_CALL -> CALL_FUNCTION_EX opcode pairs in the main interpreter loop. Patch by Brandt Bucher.

.. bpo: 36871 .. date: 2019-09-24-18-45-46 .. nonce: p47knk .. section: Core and Builtins

Improve error handling for the assert_has_calls and assert_has_awaits methods of mocks. Fixed a bug where any errors encountered while binding the expected calls to the mock's spec were silently swallowed, leading to misleading error output.

.. bpo: 11410 .. date: 2019-09-24-05-32-27 .. nonce: vS182p .. section: Core and Builtins

Better control over symbol visibility is provided through use of the visibility attributes available in gcc >= 4.0, provided in a uniform way across POSIX and Windows. The POSIX build files have been updated to compile with -fvisibility=hidden, minimising exported symbols.

.. bpo: 38219 .. date: 2019-09-22-13-56-18 .. nonce: rFl7JD .. section: Core and Builtins

Optimized the :class:dict constructor and the :meth:~dict.update method for the case when the argument is a dict.

.. bpo: 38236 .. date: 2019-09-20-19-06-23 .. nonce: eQ0Tmj .. section: Core and Builtins

Python now dumps path configuration if it fails to import the Python codecs of the filesystem and stdio encodings.

.. bpo: 38013 .. date: 2019-09-12-19-50-01 .. nonce: I7btD0 .. section: Core and Builtins

Allow to call async_generator_athrow().throw(...) even for non-started async generator helper. It fixes annoying warning at the end of :func:asyncio.run call.

.. bpo: 38124 .. date: 2019-09-12-00-14-01 .. nonce: n6E0H7 .. section: Core and Builtins

Fix an off-by-one error in PyState_AddModule that could cause out-of-bounds memory access.

.. bpo: 38116 .. date: 2019-09-11-14-49-42 .. nonce: KDwmwt .. section: Core and Builtins

The select module is now PEP-384 compliant and no longer has static state

.. bpo: 38113 .. date: 2019-09-11-14-10-02 .. nonce: yZXC3P .. section: Core and Builtins

ast module updated to PEP-384 and all statics removed

.. bpo: 38076 .. date: 2019-09-09-16-36-37 .. nonce: C5dVBl .. section: Core and Builtins

The struct module is now PEP-384 compatible

.. bpo: 38075 .. date: 2019-09-09-15-59-50 .. nonce: N8OZKF .. section: Core and Builtins

The random module is now PEP-384 compatible

.. bpo: 38074 .. date: 2019-09-09-15-40-57 .. nonce: MsVbeI .. section: Core and Builtins

zlib module made PEP-384 compatible

.. bpo: 38073 .. date: 2019-09-09-15-17-58 .. nonce: ZoKYOU .. section: Core and Builtins

Make pwd extension module PEP-384 compatible

.. bpo: 38072 .. date: 2019-09-09-15-00-42 .. nonce: Y1xpDO .. section: Core and Builtins

grp module made PEP-384 compatible

.. bpo: 38069 .. date: 2019-09-09-14-46-05 .. nonce: cn8XLv .. section: Core and Builtins

Make _posixsubprocess PEP-384 compatible

.. bpo: 38071 .. date: 2019-09-09-14-44-17 .. nonce: bLwkBJ .. section: Core and Builtins

Make termios extension module PEP-384 compatible

.. bpo: 38005 .. date: 2019-09-02-20-00-31 .. nonce: e7VsTA .. section: Core and Builtins

Fixed comparing and creating of InterpreterID and ChannelID.

.. bpo: 36946 .. date: 2019-09-02-16-17-42 .. nonce: _lAuSR .. section: Core and Builtins

Fix possible signed integer overflow when handling slices. Patch by hongweipeng.

.. bpo: 37994 .. date: 2019-08-31-11-13-25 .. nonce: Rj6S4j .. section: Core and Builtins

Fixed silencing arbitrary errors if an attribute lookup fails in several sites. Only AttributeError should be silenced.

.. bpo: 8425 .. date: 2019-08-29-01-55-38 .. nonce: FTq4A8 .. section: Core and Builtins

Optimize set difference_update for the case when the other set is much larger than the base set. (Suggested by Evgeny Kapun with code contributed by Michele Orrù).

.. bpo: 37966 .. date: 2019-08-27-21-21-36 .. nonce: 5OBLez .. section: Core and Builtins

The implementation of :func:~unicodedata.is_normalized has been greatly sped up on strings that aren't normalized, by implementing the full normalization-quick-check algorithm from the Unicode standard.

.. bpo: 37947 .. date: 2019-08-26-04-09-57 .. nonce: mzAQtB .. section: Core and Builtins

Adjust correctly the recursion level in the symtable generation for named expressions. Patch by Pablo Galindo.

.. bpo: 37812 .. date: 2019-08-23-22-46-25 .. nonce: vsWZwS .. section: Core and Builtins

The CHECK_SMALL_INT macro used inside :file:Object/longobject.c has been replaced with an explicit return at each call site.

.. bpo: 37751 .. date: 2019-08-20-04-36-37 .. nonce: CSFzUd .. section: Core and Builtins

Fix :func:codecs.lookup to normalize the encoding name the same way than :func:encodings.normalize_encoding, except that :func:codecs.lookup also converts the name to lower case.

.. bpo: 37830 .. date: 2019-08-17-18-41-59 .. nonce: fNfMbz .. section: Core and Builtins

Fixed compilation of :keyword:break and :keyword:continue in the :keyword:finally block when the corresponding :keyword:try block contains :keyword:return with a non-constant value.

.. bpo: 20490 .. date: 2019-08-15-12-48-36 .. nonce: -hXeEn .. section: Core and Builtins

Improve import error message for partially initialized module on circular from imports - by Anthony Sottile.

.. bpo: 37840 .. date: 2019-08-13-18-05-20 .. nonce: elLCci .. section: Core and Builtins

Fix handling of negative indices in :c:member:~PySequenceMethods.sq_item of :class:bytearray. Patch by Sergey Fedoseev.

.. bpo: 37802 .. date: 2019-08-09-18-28-57 .. nonce: pKxcAW .. section: Core and Builtins

Slightly improve performance of :c:func:PyLong_FromUnsignedLong, :c:func:PyLong_FromUnsignedLongLong and :c:func:PyLong_FromSize_t. Patch by Sergey Fedoseev.

.. bpo: 37409 .. date: 2019-08-06-23-39-05 .. nonce: 1qwzn2 .. section: Core and Builtins

Ensure explicit relative imports from interactive sessions and scripts (having no parent package) always raise ImportError, rather than treating the current module as the package. Patch by Ben Lewis.

.. bpo: 32912 .. date: 2019-08-06-14-03-59 .. nonce: UDwSMJ .. section: Core and Builtins

Reverted :issue:32912: emitting :exc:SyntaxWarning instead of :exc:DeprecationWarning for invalid escape sequences in string and bytes literals.

.. bpo: 37757 .. date: 2019-08-05-14-22-59 .. nonce: lRv5HX .. section: Core and Builtins

:pep:572: As described in the PEP, assignment expressions now raise :exc:SyntaxError when their interaction with comprehension scoping results in an ambiguous target scope.

The TargetScopeError subclass originally proposed by the PEP has been removed in favour of just raising regular syntax errors for the disallowed cases.

.. bpo: 36279 .. date: 2019-08-04-12-24-18 .. nonce: 8Zy7jZ .. section: Core and Builtins

Fix potential use of uninitialized memory in :func:os.wait3.

.. bpo: 36311 .. date: 2019-08-02-15-01-33 .. nonce: uY5vt- .. section: Core and Builtins

Decoding bytes objects larger than 2GiB is faster and no longer fails when a multibyte characters spans a chunk boundary.

.. bpo: 34880 .. date: 2019-08-01-10-45-51 .. nonce: u_x_CG .. section: Core and Builtins

The :keyword:assert statement now works properly if the :exc:AssertionError exception is being shadowed. Patch by Zackery Spytz.

.. bpo: 37340 .. date: 2019-07-25-11-06-57 .. nonce: 5ktLEg .. section: Core and Builtins

Removed object cache (free_list) for bound method objects. Temporary bound method objects are less used than before thanks to the LOAD_METHOD opcode and the _PyObject_VectorcallMethod C API.

.. bpo: 37648 .. date: 2019-07-22-11-05-05 .. nonce: 6TY2L- .. section: Core and Builtins

Fixed minor inconsistency in :meth:list.__contains__, :meth:tuple.__contains__ and a few other places. The collection's item is now always at the left and the needle is on the right of ==.

.. bpo: 37444 .. date: 2019-07-20-22-34-42 .. nonce: UOd3Xs .. section: Core and Builtins

Update differing exception between :meth:builtins.__import__ and :meth:importlib.__import__.

.. bpo: 37619 .. date: 2019-07-18-11-50-49 .. nonce: X6Lulo .. section: Core and Builtins

When adding a wrapper descriptor from one class to a different class (for example, setting __add__ = str.__add__ on an int subclass), an exception is correctly raised when the operator is called.

.. bpo: 37593 .. date: 2019-07-14-23-57-27 .. nonce: yHSTwH .. section: Core and Builtins

Swap the positions of the posonlyargs and args parameters in the constructor of :class:ast.parameters nodes.

.. bpo: 37543 .. date: 2019-07-10-20-33-53 .. nonce: EvI19D .. section: Core and Builtins

Optimized pymalloc for non PGO build.

.. bpo: 37537 .. date: 2019-07-10-09-56-47 .. nonce: OkB0wd .. section: Core and Builtins

Compute allocated pymalloc blocks inside _Py_GetAllocatedBlocks(). This slows down _Py_GetAllocatedBlocks() but gives a small speedup to _PyObject_Malloc() and _PyObject_Free().

.. bpo: 37467 .. date: 2019-07-01-12-22-44 .. nonce: u-XyEu .. section: Core and Builtins

Fix :func:sys.excepthook and :c:func:PyErr_Display if a filename is a bytes string. For example, for a SyntaxError exception where the filename attribute is a bytes string.

.. bpo: 37433 .. date: 2019-06-27-15-01-14 .. nonce: amNGqr .. section: Core and Builtins

Fix SyntaxError indicator printing too many spaces for multi-line strings - by Anthony Sottile.

.. bpo: 37417 .. date: 2019-06-26-18-41-00 .. nonce: VsZeHL .. section: Core and Builtins

:meth:bytearray.extend now correctly handles errors that arise during iteration. Patch by Brandt Bucher.

.. bpo: 37414 .. date: 2019-06-26-17-27-26 .. nonce: o6Lnbc .. section: Core and Builtins

The undocumented sys.callstats() function has been removed. Since Python 3.7, it was deprecated and always returned None. It required a special build option CALL_PROFILE which was already removed in Python 3.7.

.. bpo: 37392 .. date: 2019-06-25-01-45-06 .. nonce: J3JhIx .. section: Core and Builtins

Remove sys.getcheckinterval() and sys.setcheckinterval() functions. They were deprecated since Python 3.2. Use :func:sys.getswitchinterval and :func:sys.setswitchinterval instead. Remove also check_interval field of the PyInterpreterState structure.

.. bpo: 37388 .. date: 2019-06-24-21-53-52 .. nonce: 0XTZmW .. section: Core and Builtins

In development mode and in debug build, encoding and errors arguments are now checked on string encoding and decoding operations. Examples: :func:open, :meth:str.encode and :meth:bytes.decode.

By default, for best performances, the errors argument is only checked at the first encoding/decoding error, and the encoding argument is sometimes ignored for empty strings.

.. bpo: 37348 .. date: 2019-06-23-00-26-30 .. nonce: pp8P-x .. section: Core and Builtins

Optimized decoding short ASCII string with UTF-8 and ascii codecs. b"foo".decode() is about 15% faster. Patch by Inada Naoki.

.. bpo: 24214 .. date: 2019-06-22-12-45-20 .. nonce: hIiHeD .. section: Core and Builtins

Improved support of the surrogatepass error handler in the UTF-8 and UTF-16 incremental decoders.

.. bpo: 37330 .. date: 2019-06-18-17-53-06 .. nonce: wAvHmz .. section: Core and Builtins

:func:open, :func:io.open, :func:codecs.open and :class:fileinput.FileInput no longer accept 'U' ("universal newline") in the file mode. This flag was deprecated since Python 3.3.

.. bpo: 35224 .. date: 2019-06-17-06-03-55 .. nonce: FHWPGv .. section: Core and Builtins

Reverse evaluation order of key: value in dict comprehensions as proposed in PEP 572. I.e. in {k: v for ...}, k will be evaluated before v.

.. bpo: 37316 .. date: 2019-06-17-03-53-16 .. nonce: LytDX_ .. section: Core and Builtins

Fix the :c:func:PySys_Audit call in :class:mmap.mmap.

.. bpo: 37300 .. date: 2019-06-16-02-38-25 .. nonce: WJkgKV .. section: Core and Builtins

Remove an unnecessary Py_XINCREF in classobject.c.

.. bpo: 37269 .. date: 2019-06-14-06-32-33 .. nonce: SjVVAe .. section: Core and Builtins

Fix a bug in the peephole optimizer that was not treating correctly constant conditions with binary operators. Patch by Pablo Galindo.

.. bpo: 20443 .. date: 2019-06-13-12-55-38 .. nonce: bQWAxg .. section: Core and Builtins

Python now gets the absolute path of the script filename specified on the command line (ex: "python3 script.py"): the file attribute of the main module and sys.path[0] become an absolute path, rather than a relative path.

.. bpo: 37257 .. date: 2019-06-13-02-27-12 .. nonce: IMxDvT .. section: Core and Builtins

Python's small object allocator (obmalloc.c) now allows (no more than) one empty arena to remain available for immediate reuse, without returning it to the OS. This prevents thrashing in simple loops where an arena could be created and destroyed anew on each iteration.

.. bpo: 37231 .. date: 2019-06-12-14-39-16 .. nonce: LF41Es .. section: Core and Builtins

The dispatching of type slots to special methods (for example calling __mul__ when doing x * y) has been made faster.

.. bpo: 36974 .. date: 2019-06-11-12-59-38 .. nonce: bVYmSA .. section: Core and Builtins

Implemented separate vectorcall functions for every calling convention of builtin functions and methods. This improves performance for calls.

.. bpo: 37213 .. date: 2019-06-11-11-15-19 .. nonce: UPii5K .. section: Core and Builtins

Handle correctly negative line offsets in the peephole optimizer. Patch by Pablo Galindo.

.. bpo: 37219 .. date: 2019-06-10-23-18-31 .. nonce: jPSufq .. section: Core and Builtins

Remove erroneous optimization for empty set differences.

.. bpo: 15913 .. date: 2019-06-06-20-52-38 .. nonce: 5Sg5cv .. section: Core and Builtins

Implement :c:func:PyBuffer_SizeFromFormat() function (previously documented but not implemented): call :func:struct.calcsize. Patch by Joannah Nanjekye.

.. bpo: 36922 .. date: 2019-06-06-13-59-52 .. nonce: EMZ3TF .. section: Core and Builtins

Slot functions optimize any callable with Py_TPFLAGS_METHOD_DESCRIPTOR instead of only instances of function.

.. bpo: 36974 .. date: 2019-06-06-11-00-55 .. nonce: wdzzym .. section: Core and Builtins

The slot tp_vectorcall_offset is inherited unconditionally to support super().__call__() when the base class uses vectorcall.

.. bpo: 37160 .. date: 2019-06-05-09-24-17 .. nonce: O3IAY3 .. section: Core and Builtins

:func:threading.get_native_id now also supports NetBSD.

.. bpo: 37077 .. date: 2019-05-28-11-47-44 .. nonce: S1h0Fc .. section: Core and Builtins

Add :func:threading.get_native_id support for AIX. Patch by M. Felt

.. bpo: 36781 .. date: 2019-05-06-09-59-31 .. nonce: uocWt6 .. section: Core and Builtins

:func:sum has been optimized for boolean values.

.. bpo: 34556 .. date: 2019-05-05-18-09-40 .. nonce: o9kfpu .. section: Core and Builtins

Add --upgrade-deps to venv module. Patch by Cooper Ry Lees

.. bpo: 20523 .. date: 2019-02-15-20-42-36 .. nonce: rRLrvr .. section: Core and Builtins

pdb.Pdb supports ~/.pdbrc in Windows 7. Patch by Tim Hopper and Dan Lidral-Porter.

.. bpo: 35551 .. date: 2019-01-18-16-16-27 .. nonce: oF5pbO .. section: Core and Builtins

Updated encodings: - Removed the "tis260" encoding, which was an alias for the nonexistent "tactis" codec. - Added "mac_centeuro" as an alias for the mac_latin2 encoding.

.. bpo: 19072 .. date: 2018-07-23-13-09-54 .. nonce: Gc59GS .. section: Core and Builtins

The :class:classmethod decorator can now wrap other descriptors such as property objects. Adapted from a patch written by Graham Dumpleton.

.. bpo: 27575 .. date: 2018-06-14-13-55-45 .. nonce: mMYgzv .. section: Core and Builtins

Improve speed of dictview intersection by directly using set intersection logic. Patch by David Su.

.. bpo: 30773 .. date: 2018-06-07-01-01-20 .. nonce: C31rVE .. section: Core and Builtins

Prohibit parallel running of aclose() / asend() / athrow(). Fix ag_running to reflect the actual running status of the AG.

.. bpo: 36589 .. date: 2019-11-16-22-56-51 .. nonce: 0Io76D .. section: Library

The :func:curses.update_lines_cols function now returns None instead of 1 on success.

.. bpo: 38807 .. date: 2019-11-15-09-30-29 .. nonce: PsmRog .. section: Library

Update :exc:TypeError messages for :meth:os.path.join to include :class:os.PathLike objects as acceptable input types.

.. bpo: 38724 .. date: 2019-11-14-14-13-29 .. nonce: T5ySfR .. section: Library

Add a repr for subprocess.Popen objects. Patch by Andrey Doroschenko.

.. bpo: 38786 .. date: 2019-11-13-16-49-03 .. nonce: gNOwKh .. section: Library

pydoc now recognizes and parses HTTPS URLs. Patch by python273.

.. bpo: 38785 .. date: 2019-11-13-16-17-43 .. nonce: NEOEfk .. section: Library

Prevent asyncio from crashing if parent __init__ is not called from a constructor of object derived from asyncio.Future.

.. bpo: 38723 .. date: 2019-11-12-15-46-28 .. nonce: gcdMFn .. section: Library

:mod:pdb now uses :meth:io.open_code to trigger auditing events.

.. bpo: 27805 .. date: 2019-11-11-21-43-06 .. nonce: D3zl1_ .. section: Library

Allow opening pipes and other non-seekable files in append mode with :func:open.

.. bpo: 38438 .. date: 2019-11-11-06-14-25 .. nonce: vSVeHN .. section: Library

Simplify the :mod:argparse usage message for nargs="*".

.. bpo: 38761 .. date: 2019-11-10-13-40-33 .. nonce: P1UUIZ .. section: Library

WeakSet is now registered as a collections.abc.MutableSet.

.. bpo: 38716 .. date: 2019-11-06-15-58-07 .. nonce: R3uMLT .. section: Library

logging: change RotatingHandler namer and rotator to class-level attributes. This stops init from setting them to None in the case where a subclass defines them with eponymous methods.

.. bpo: 38713 .. date: 2019-11-05-21-22-22 .. nonce: bmhquU .. section: Library

Add :const:os.P_PIDFD constant, which may be passed to :func:os.waitid to wait on a Linux process file descriptor.

.. bpo: 38692 .. date: 2019-11-05-19-15-57 .. nonce: 2DCDA- .. section: Library

Add :class:asyncio.PidfdChildWatcher, a Linux-specific child watcher implementation that polls process file descriptors.

.. bpo: 38692 .. date: 2019-11-05-07-18-24 .. nonce: UpatA7 .. section: Library

Expose the Linux pidfd_open syscall as :func:os.pidfd_open.

.. bpo: 38602 .. date: 2019-10-27-22-29-45 .. nonce: 7jvYFA .. section: Library

Added constants :const:~fcntl.F_OFD_GETLK, :const:~fcntl.F_OFD_SETLK and :const:~fcntl.F_OFD_SETLKW to the :mod:fcntl module. Patch by Donghee Na.

.. bpo: 38334 .. date: 2019-10-27-00-08-49 .. nonce: pfLLmc .. section: Library

Fixed seeking backward on an encrypted :class:zipfile.ZipExtFile.

.. bpo: 38312 .. date: 2019-10-26-14-42-20 .. nonce: e_FVWh .. section: Library

Add :func:curses.get_escdelay, :func:curses.set_escdelay, :func:curses.get_tabsize, and :func:curses.set_tabsize functions - by Anthony Sottile.

.. bpo: 38586 .. date: 2019-10-24-17-26-39 .. nonce: cyq5nr .. section: Library

Now :func:~logging.config.fileConfig correctly sets the .name of handlers loaded.

.. bpo: 38565 .. date: 2019-10-24-08-10-30 .. nonce: SWSUst .. section: Library

Add new cache_parameters() method for functools.lru_cache() to better support pickling.

.. bpo: 34679 .. date: 2019-10-23-16-25-12 .. nonce: Bnw8o3 .. section: Library

asynci.ProactorEventLoop.close() now only calls signal.set_wakeup_fd() in the main thread.

.. bpo: 31202 .. date: 2019-10-20-12-04-48 .. nonce: NfdIus .. section: Library

The case the result of :func:pathlib.WindowsPath.glob matches now the case of the pattern for literal parts.

.. bpo: 36321 .. date: 2019-10-19-21-41-20 .. nonce: CFlxfy .. section: Library

Remove misspelled attribute. The 3.8 changelog noted that this would be removed in 3.9.

.. bpo: 38521 .. date: 2019-10-18-13-57-31 .. nonce: U-7aaM .. section: Library

Fixed erroneous equality comparison in statistics.NormalDist().

.. bpo: 38493 .. date: 2019-10-16-19-56-51 .. nonce: 86ExWB .. section: Library

Added :const:~os.CLD_KILLED and :const:~os.CLD_STOPPED for :attr:si_code. Patch by Donghee Na.

.. bpo: 38478 .. date: 2019-10-15-11-37-57 .. nonce: A87OPO .. section: Library

Fixed a bug in :meth:inspect.signature.bind that was causing it to fail when handling a keyword argument with same name as positional-only parameter. Patch by Pablo Galindo.

.. bpo: 33604 .. date: 2019-10-15-09-47-40 .. nonce: J12cWT .. section: Library

Fixed hmac.new and hmac.HMAC to raise TypeError instead of ValueError when the digestmod parameter, now required in 3.8, is omitted. Also clarified the hmac module documentation and docstrings.

.. bpo: 38378 .. date: 2019-10-13-11-00-03 .. nonce: yYNpSm .. section: Library

Parameters out and in of :func:os.sendfile was renamed to out_fd and in_fd.

.. bpo: 38417 .. date: 2019-10-12-00-13-47 .. nonce: W7x_aS .. section: Library

Added support for setting the umask in the child process to the subprocess module on POSIX systems.

.. bpo: 38449 .. date: 2019-10-11-18-49-00 .. nonce: 9TWMlz .. section: Library

Revert PR 15522, which introduces a regression in :meth:mimetypes.guess_type due to improper handling of filenames as urls.

.. bpo: 38431 .. date: 2019-10-10-16-53-00 .. nonce: d5wzNp .. section: Library

Fix __repr__ method for :class:dataclasses.InitVar to support typing objects, patch by Samuel Colvin.

.. bpo: 38109 .. date: 2019-10-10-00-25-28 .. nonce: 9w-IGF .. section: Library

Add missing :const:stat.S_IFDOOR, :const:stat.S_IFPORT, :const:stat.S_IFWHT, :func:stat.S_ISDOOR, :func:stat.S_ISPORT, and :func:stat.S_ISWHT values to the Python implementation of :mod:stat.

.. bpo: 38422 .. date: 2019-10-09-18-16-51 .. nonce: aiM5bq .. section: Library

Clarify docstrings of pathlib suffix(es)

.. bpo: 38405 .. date: 2019-10-08-11-18-40 .. nonce: 0-7e7s .. section: Library

Nested subclasses of :class:typing.NamedTuple are now pickleable.

.. bpo: 38332 .. date: 2019-10-05-02-07-52 .. nonce: hwrPN7 .. section: Library

Prevent :exc:KeyError thrown by :func:!_encoded_words.decode when given an encoded-word with invalid content-type encoding from propagating all the way to :func:email.message.get.

.. bpo: 38371 .. date: 2019-10-04-18-39-59 .. nonce: S6Klvm .. section: Library

Deprecated the split() method in :class:!_tkinter.TkappType in favour of the splitlist() method which has more consistent and predictable behavior.

.. bpo: 38341 .. date: 2019-10-01-21-06-18 .. nonce: uqwgU_ .. section: Library

Add :exc:smtplib.SMTPNotSupportedError to the :mod:smtplib exported names.

.. bpo: 38319 .. date: 2019-09-30-22-06-33 .. nonce: 5QjiDa .. section: Library

sendfile() used in socket and shutil modules was raising OverflowError for files >= 2GiB on 32-bit architectures. (patch by Giampaolo Rodola)

.. bpo: 38242 .. date: 2019-09-30-00-15-27 .. nonce: uPIyAc .. section: Library

Revert the new asyncio Streams API

.. bpo: 13153 .. date: 2019-09-29-22-47-37 .. nonce: 0mO9qR .. section: Library

OS native encoding is now used for converting between Python strings and Tcl objects. This allows to display, copy and paste to clipboard emoji and other non-BMP characters. Converting strings from Tcl to Python and back now never fails (except MemoryError).

.. bpo: 38019 .. date: 2019-09-29-13-50-24 .. nonce: 6MoOE3 .. section: Library

Correctly handle pause/resume reading of closed asyncio unix pipe.

.. bpo: 38163 .. date: 2019-09-28-20-16-40 .. nonce: x51-vK .. section: Library

Child mocks will now detect their type as either synchronous or asynchronous, asynchronous child mocks will be AsyncMocks and synchronous child mocks will be either MagicMock or Mock (depending on their parent type).

.. bpo: 38161 .. date: 2019-09-27-16-31-28 .. nonce: zehai1 .. section: Library

Removes _AwaitEvent from AsyncMock.

.. bpo: 38216 .. date: 2019-09-27-15-24-45 .. nonce: -7yvZR .. section: Library

Allow the rare code that wants to send invalid http requests from the http.client library a way to do so. The fixes for bpo-30458 led to breakage for some projects that were relying on this ability to test their own behavior in the face of bad requests.

.. bpo: 28286 .. date: 2019-09-26-12-16-30 .. nonce: LdSsrN .. section: Library

Deprecate opening :class:~gzip.GzipFile for writing implicitly. Always specify the mode argument for writing.

.. bpo: 38108 .. date: 2019-09-25-21-37-02 .. nonce: Jr9HU6 .. section: Library

Any synchronous magic methods on an AsyncMock now return a MagicMock. Any asynchronous magic methods on a MagicMock now return an AsyncMock.

.. bpo: 38265 .. date: 2019-09-25-05-16-19 .. nonce: X6-gsT .. section: Library

Update the length parameter of :func:os.pread to accept :c:type:Py_ssize_t instead of :c:expr:int.

.. bpo: 38112 .. date: 2019-09-24-10-55-01 .. nonce: 2EinX9 .. section: Library

:mod:compileall has a higher default recursion limit and new command-line arguments for path manipulation, symlinks handling, and multiple optimization levels.

.. bpo: 38248 .. date: 2019-09-22-13-05-36 .. nonce: Yo3N_1 .. section: Library

asyncio: Fix inconsistent immediate Task cancellation

.. bpo: 38237 .. date: 2019-09-20-14-27-17 .. nonce: xRUZbx .. section: Library

The arguments for the builtin pow function are more descriptive. They can now also be passed in as keywords.

.. bpo: 34002 .. date: 2019-09-19-19-58-33 .. nonce: KBnaVX .. section: Library

Improve efficiency in parts of email package by changing while-pop to a for loop, using isdisjoint instead of set intersections.

.. bpo: 38191 .. date: 2019-09-17-12-28-27 .. nonce: 1TU0HV .. section: Library

Constructors of :class:~typing.NamedTuple and :class:~typing.TypedDict types now accept arbitrary keyword argument names, including "cls", "self", "typename", "_typename", "fields" and "_fields".

.. bpo: 38155 .. date: 2019-09-16-21-47-48 .. nonce: d92lRc .. section: Library

Add __all__ to :mod:datetime. Patch by Tahia Khan.

.. bpo: 38185 .. date: 2019-09-16-19-12-57 .. nonce: zYWppY .. section: Library

Fixed case-insensitive string comparison in :class:sqlite3.Row indexing.

.. bpo: 38136 .. date: 2019-09-16-09-54-42 .. nonce: MdI-Zb .. section: Library

Changes AsyncMock call count and await count to be two different counters. Now await count only counts when a coroutine has been awaited, not when it has been called, and vice-versa. Update the documentation around this.

.. bpo: 37828 .. date: 2019-09-15-21-31-18 .. nonce: gLLDX7 .. section: Library

Fix default mock name in :meth:unittest.mock.Mock.assert_called exceptions. Patch by Abraham Toriz Cruz.

.. bpo: 38175 .. date: 2019-09-15-10-30-33 .. nonce: 61XlUv .. section: Library

Fix a memory leak in comparison of :class:sqlite3.Row objects.

.. bpo: 33936 .. date: 2019-09-14-10-34-00 .. nonce: 8wCI_n .. section: Library

_hashlib no longer calls obsolete OpenSSL initialization function with OpenSSL 1.1.0+.

.. bpo: 34706 .. date: 2019-09-13-14-54-33 .. nonce: HWVpOY .. section: Library

Preserve subclassing in inspect.Signature.from_callable.

.. bpo: 38153 .. date: 2019-09-13-12-18-51 .. nonce: nHAbuJ .. section: Library

Names of hashing algorithms from OpenSSL are now normalized to follow Python's naming conventions. For example OpenSSL uses sha3-512 instead of sha3_512 or blake2b512 instead of blake2b.

.. bpo: 38115 .. date: 2019-09-13-09-24-58 .. nonce: BOO-Y1 .. section: Library

Fix a bug in dis.findlinestarts() where it would return invalid bytecode offsets. Document that a code object's co_lnotab can contain invalid bytecode offsets.

.. bpo: 38148 .. date: 2019-09-13-08-55-43 .. nonce: Lnww6D .. section: Library

Add slots to :mod:asyncio transport classes, which can reduce memory usage.

.. bpo: 38142 .. date: 2019-09-12-18-41-35 .. nonce: 1I0Ch0 .. section: Library

The _hashlib OpenSSL wrapper extension module is now PEP-384 compliant.

.. bpo: 9216 .. date: 2019-09-12-14-54-45 .. nonce: W7QMpC .. section: Library

hashlib constructors now support usedforsecurity flag to signal that a hashing algorithm is not used in a security context.

.. bpo: 36991 .. date: 2019-09-12-14-52-38 .. nonce: 1OcSm8 .. section: Library

Fixes a potential incorrect AttributeError exception escaping ZipFile.extract() in some unsupported input error situations.

.. bpo: 38134 .. date: 2019-09-12-13-18-55 .. nonce: gXJTbP .. section: Library

Remove obsolete copy of PBKDF2_HMAC_fast. All supported OpenSSL versions contain a fast implementation.

.. bpo: 38132 .. date: 2019-09-12-12-47-35 .. nonce: KSFx1F .. section: Library

The OpenSSL hashlib wrapper uses a simpler implementation. Several Macros and pointless caches are gone. The hash name now comes from OpenSSL's EVP. The algorithm name stays the same, except it is now always lower case.

.. bpo: 38008 .. date: 2019-09-12-10-47-34 .. nonce: sH74Iy .. section: Library

Fix parent class check in protocols to correctly identify the module that provides a builtin protocol, instead of assuming they all come from the :mod:collections.abc module

.. bpo: 34037 .. date: 2019-09-11-21-38-41 .. nonce: LIAS_3 .. section: Library

For :mod:asyncio, add a new coroutine :meth:loop.shutdown_default_executor. The new coroutine provides an API to schedule an executor shutdown that waits on the threadpool to finish closing. Also, :func:asyncio.run has been updated to utilize the new coroutine. Patch by Kyle Stanley.

.. bpo: 37405 .. date: 2019-09-11-20-27-41 .. nonce: MG5xiY .. section: Library

Fixed regression bug for socket.getsockname() for non-CAN_ISOTP AF_CAN address family sockets by returning a 1-tuple instead of string.

.. bpo: 38121 .. date: 2019-09-11-16-54-57 .. nonce: SrSDzB .. section: Library

Update parameter names on functions in importlib.metadata matching the changes in the 0.22 release of importlib_metadata.

.. bpo: 38110 .. date: 2019-09-11-14-49-20 .. nonce: A19Y-q .. section: Library

The os.closewalk() implementation now uses the libc fdwalk() API on platforms where it is available.

.. bpo: 38093 .. date: 2019-09-11-14-45-30 .. nonce: yQ6k7y .. section: Library

Fixes AsyncMock so it doesn't crash when used with AsyncContextManagers or AsyncIterators.

.. bpo: 37488 .. date: 2019-09-11-11-44-16 .. nonce: S8CJUL .. section: Library

Add warning to :meth:datetime.utctimetuple, :meth:datetime.utcnow and :meth:datetime.utcfromtimestamp .

.. bpo: 35640 .. date: 2019-09-10-15-52-55 .. nonce: X0lp5f .. section: Library

Allow passing a :term:path-like object as directory argument to the :class:http.server.SimpleHTTPRequestHandler class. Patch by Géry Ogam.

.. bpo: 38086 .. date: 2019-09-10-11-42-59 .. nonce: w5TlG- .. section: Library

Update importlib.metadata with changes from importlib_metadata 0.21 <https://gitlab.com/python-devs/importlib_metadata/blob/0.21/importlib_metadata/docs/changelog.rst>_.

.. bpo: 37251 .. date: 2019-09-10-10-59-50 .. nonce: 8zn2o3 .. section: Library

Remove __code__ check in AsyncMock that incorrectly evaluated function specs as async objects but failed to evaluate classes with __await__ but no __code__ attribute defined as async objects.

.. bpo: 38037 .. date: 2019-09-09-18-39-23 .. nonce: B0UgFU .. section: Library

Fix reference counters in the :mod:signal module.

.. bpo: 38066 .. date: 2019-09-09-14-39-47 .. nonce: l9mWv- .. section: Library

Hide internal asyncio.Stream methods: feed_eof(), feed_data(), set_exception() and set_transport().

.. bpo: 38059 .. date: 2019-09-08-11-36-50 .. nonce: 8SA6co .. section: Library

inspect.py now uses sys.exit() instead of exit()

.. bpo: 38049 .. date: 2019-09-07-12-32-50 .. nonce: xKP4tf .. section: Library

Added command-line interface for the :mod:ast module.

.. bpo: 37953 .. date: 2019-09-06-17-40-34 .. nonce: db5FQq .. section: Library

In :mod:typing, improved the __hash__ and __eq__ methods for :class:ForwardReferences.

.. bpo: 38026 .. date: 2019-09-04-20-34-14 .. nonce: 0LLRX- .. section: Library

Fixed :func:inspect.getattr_static used isinstance while it should avoid dynamic lookup.

.. bpo: 35923 .. date: 2019-09-03-01-41-35 .. nonce: lYpKbY .. section: Library

Update :class:importlib.machinery.BuiltinImporter to use loader._ORIGIN instead of a hardcoded value. Patch by Donghee Na.

.. bpo: 38010 .. date: 2019-09-02-14-30-39 .. nonce: JOnz9Z .. section: Library

In importlib.metadata sync with importlib_metadata 0.20, clarifying behavior of files() and fixing issue where only one requirement was returned for requires() on dist-info packages.

.. bpo: 38006 .. date: 2019-09-02-13-37-27 .. nonce: Y7vA0Q .. section: Library

weakref.WeakValueDictionary defines a local remove() function used as callback for weak references. This function was created with a closure. Modify the implementation to avoid the closure.

.. bpo: 37995 .. date: 2019-08-31-13-36-09 .. nonce: rS8HzT .. section: Library

Added the indent option to :func:ast.dump which allows it to produce a multiline indented output.

.. bpo: 34410 .. date: 2019-08-31-01-52-59 .. nonce: 7KbWZQ .. section: Library

Fixed a crash in the :func:tee iterator when re-enter it. RuntimeError is now raised in this case.

.. bpo: 37140 .. date: 2019-08-30-11-21-10 .. nonce: cFAX-a .. section: Library

Fix a ctypes regression of Python 3.8. When a ctypes.Structure is passed by copy to a function, ctypes internals created a temporary object which had the side effect of calling the structure finalizer (del) twice. The Python semantics requires a finalizer to be called exactly once. Fix ctypes internals to no longer call the finalizer twice.

.. bpo: 37587 .. date: 2019-08-29-18-48-48 .. nonce: N7TGTC .. section: Library

_json.scanstring is now up to 3x faster when there are many backslash escaped characters in the JSON string.

.. bpo: 37834 .. date: 2019-08-29-16-41-36 .. nonce: FThnsh .. section: Library

Prevent shutil.rmtree exception when built on non-Windows system without fd system call support, like older versions of macOS.

.. bpo: 10978 .. date: 2019-08-29-01-19-13 .. nonce: J6FQYY .. section: Library

Semaphores and BoundedSemaphores can now release more than one waiting thread at a time.

.. bpo: 37972 .. date: 2019-08-28-21-40-12 .. nonce: kP-n4L .. section: Library

Subscripts to the unittest.mock.call objects now receive the same chaining mechanism as any other custom attributes, so that the following usage no longer raises a TypeError:

call().foo().__getitem__('bar')

Patch by blhsing

.. bpo: 37965 .. date: 2019-08-28-14-04-18 .. nonce: 7xGE-C .. section: Library

Fix C compiler warning caused by distutils.ccompiler.CCompiler.has_function.

.. bpo: 37964 .. date: 2019-08-27-21-19-28 .. nonce: SxdnsF .. section: Library

Add F_GETPATH command to :mod:fcntl.

.. bpo: 37960 .. date: 2019-08-27-10-52-13 .. nonce: CTY7Lw .. section: Library

repr() of buffered and text streams now silences only expected exceptions when get the value of "name" and "mode" attributes.

.. bpo: 37961 .. date: 2019-08-27-10-30-44 .. nonce: 4nm0zZ .. section: Library

Add a total_nframe field to the traces collected by the tracemalloc module. This field indicates the original number of frames before it was truncated.

.. bpo: 37951 .. date: 2019-08-27-10-03-48 .. nonce: MfRQgL .. section: Library

Most features of the subprocess module now work again in subinterpreters. Only preexec_fn is restricted in subinterpreters.

.. bpo: 36205 .. date: 2019-08-27-03-53-26 .. nonce: AfkGRl .. section: Library

Fix the rusage implementation of time.process_time() to correctly report the sum of the system and user CPU time.

.. bpo: 37950 .. date: 2019-08-26-10-45-51 .. nonce: -K1IKT .. section: Library

Fix :func:ast.dump when call with incompletely initialized node.

.. bpo: 34679 .. date: 2019-08-25-18-07-48 .. nonce: HECzL7 .. section: Library

Restores instantiation of Windows IOCP event loops from the non-main thread.

.. bpo: 36917 .. date: 2019-08-25-14-56-42 .. nonce: GBxdw2 .. section: Library

Add default implementation of the :meth:ast.NodeVisitor.visit_Constant method which emits a deprecation warning and calls corresponding methods visit_Num(), visit_Str(), etc.

.. bpo: 37798 .. date: 2019-08-24-16-54-49 .. nonce: 7mRQCk .. section: Library

Update test_statistics.py to verify that the statistics module works well for both C and Python implementations. Patch by Donghee Na

.. bpo: 26589 .. date: 2019-08-23-00-55-19 .. nonce: M1xyxG .. section: Library

Added a new status code to the http module: 451 UNAVAILABLE_FOR_LEGAL_REASONS

.. bpo: 37915 .. date: 2019-08-22-16-13-27 .. nonce: xyoZI5 .. section: Library

Fix a segmentation fault that appeared when comparing instances of datetime.timezone and datetime.tzinfo objects. Patch by Pablo Galindo.

.. bpo: 32554 .. date: 2019-08-22-01-49-05 .. nonce: 4xiXyM .. section: Library

Deprecate having random.seed() call hash on arbitrary types.

.. bpo: 9938 .. date: 2019-08-21-16-38-56 .. nonce: t3G7N9 .. section: Library

Add optional keyword argument exit_on_error for :class:ArgumentParser.

.. bpo: 37851 .. date: 2019-08-21-13-43-04 .. nonce: mIIfD_ .. section: Library

The :mod:faulthandler module no longer allocates its alternative stack at Python startup. Now the stack is only allocated at the first faulthandler usage.

.. bpo: 32793 .. date: 2019-08-20-05-17-32 .. nonce: cgpXl6 .. section: Library

Fix a duplicated debug message when :meth:smtplib.SMTP.connect is called.

.. bpo: 37885 .. date: 2019-08-19-10-31-41 .. nonce: 4Nc9sp .. section: Library

venv: Don't generate unset variable warning on deactivate.

.. bpo: 37868 .. date: 2019-08-17-22-33-54 .. nonce: hp64fi .. section: Library

Fix dataclasses.is_dataclass when given an instance that never raises AttributeError in getattr. That is, an object that returns something for dataclass_fields even if it's not a dataclass.

.. bpo: 37811 .. date: 2019-08-14-21-41-07 .. nonce: d1xYj7 .. section: Library

Fix socket module's socket.connect(address) function being unable to establish connection in case of interrupted system call. The problem was observed on all OSes which poll(2) system call can take only non-negative integers and -1 as a timeout value.

.. bpo: 37863 .. date: 2019-08-14-20-46-39 .. nonce: CkXqgX .. section: Library

Optimizations for Fraction.hash suggested by Tim Peters.

.. bpo: 21131 .. date: 2019-08-14-15-34-23 .. nonce: 0MMQRi .. section: Library

Fix faulthandler.register(chain=True) stack. faulthandler now allocates a dedicated stack of SIGSTKSZ*2 bytes, instead of just SIGSTKSZ bytes. Calling the previous signal handler in faulthandler signal handler uses more than SIGSTKSZ bytes of stack memory on some platforms.

.. bpo: 37798 .. date: 2019-08-14-13-51-24 .. nonce: AmXrik .. section: Library

Add C fastpath for statistics.NormalDist.inv_cdf() Patch by Donghee Na

.. bpo: 37804 .. date: 2019-08-12-23-07-47 .. nonce: Ene6L- .. section: Library

Remove the deprecated method threading.Thread.isAlive(). Patch by Donghee Na.

.. bpo: 37819 .. date: 2019-08-11-10-34-19 .. nonce: LVJls- .. section: Library

Add Fraction.as_integer_ratio() to match the corresponding methods in bool, int, float, and decimal.

.. bpo: 14465 .. date: 2019-08-10-18-50-04 .. nonce: qZGC4g .. section: Library

Add an xml.etree.ElementTree.indent() function for pretty-printing XML trees. Contributed by Stefan Behnel.

.. bpo: 37810 .. date: 2019-08-10-12-33-27 .. nonce: d4zbvB .. section: Library

Fix :mod:difflib ? hint in diff output when dealing with tabs. Patch by Anthony Sottile.

.. bpo: 37772 .. date: 2019-08-07-23-48-09 .. nonce: hLCvdn .. section: Library

In zipfile.Path, when adding implicit dirs, ensure that ancestral directories are added and that duplicates are excluded.

.. bpo: 18578 .. date: 2019-08-07-19-34-07 .. nonce: xfvdb_ .. section: Library

Renamed and documented test.bytecode_helper as test.support.bytecode_helper. Patch by Joannah Nanjekye.

.. bpo: 37785 .. date: 2019-08-07-14-49-22 .. nonce: y7OlT8 .. section: Library

Fix xgettext warnings in :mod:argparse.

.. bpo: 34488 .. date: 2019-08-06-21-30-58 .. nonce: OqxVo8 .. section: Library

:meth:writelines method of :class:io.BytesIO is now slightly faster when many small lines are passed. Patch by Sergey Fedoseev.

.. bpo: 37449 .. date: 2019-08-04-17-22-33 .. nonce: ycbL2z .. section: Library

ensurepip now uses importlib.resources.read_binary() to read data instead of pkgutil.get_data(). Patch by Joannah Nanjekye.

.. bpo: 28292 .. date: 2019-08-04-11-47-58 .. nonce: vkihH5 .. section: Library

Mark calendar.py helper functions as being private. The follows PEP 8 guidance to maintain the style conventions in the module and it addresses a known case of user confusion.

.. bpo: 18049 .. date: 2019-08-02-16-44-42 .. nonce: OA4qBL .. section: Library

Add definition of THREAD_STACK_SIZE for AIX in Python/thread_pthread.h The default thread stacksize caused crashes with the default recursion limit Patch by M Felt

.. bpo: 37742 .. date: 2019-08-02-14-01-25 .. nonce: f4Xn9S .. section: Library

The logging.getLogger() API now returns the root logger when passed the name 'root', whereas previously it returned a non-root logger named 'root'. This could affect cases where user code explicitly wants a non-root logger named 'root', or instantiates a logger using logging.getLogger(name) in some top-level module called 'root.py'.

.. bpo: 37738 .. date: 2019-08-01-17-11-16 .. nonce: A3WWcT .. section: Library

Fix the implementation of curses addch(str, color_pair): pass the color pair to setcchar(), instead of always passing 0 as the color pair.

.. bpo: 37723 .. date: 2019-07-31-16-49-01 .. nonce: zq6tw8 .. section: Library

Fix performance regression on regular expression parsing with huge character sets. Patch by Yann Vaginay.

.. bpo: 35943 .. date: 2019-07-31-15-52-51 .. nonce: -KswoB .. section: Library

The function :c:func:PyImport_GetModule now ensures any module it returns is fully initialized. Patch by Joannah Nanjekye.

.. bpo: 32178 .. date: 2019-07-30-22-41-05 .. nonce: X-IFLe .. section: Library

Fix IndexError in :mod:email package when trying to parse invalid address fields starting with :.

.. bpo: 37268 .. date: 2019-07-30-01-27-29 .. nonce: QDmA44 .. section: Library

The :mod:parser module is deprecated and will be removed in future versions of Python.

.. bpo: 11953 .. date: 2019-07-29-21-39-45 .. nonce: 4Hpwf9 .. section: Library

Completing WSA* error codes in :mod:socket.

.. bpo: 37685 .. date: 2019-07-28-22-25-25 .. nonce: _3bN9f .. section: Library

Fixed comparisons of :class:datetime.timedelta and :class:datetime.timezone.

.. bpo: 37697 .. date: 2019-07-28-17-44-21 .. nonce: 7UV5d0 .. section: Library

Synchronize importlib.metadata with importlib_metadata 0.19 <https://gitlab.com/python-devs/importlib_metadata/-/milestones/20>_, improving handling of EGG-INFO files and fixing a crash when entry point names contained colons.

.. bpo: 37695 .. date: 2019-07-27-20-21-03 .. nonce: QANdvg .. section: Library

Correct :func:curses.unget_wch error message. Patch by Anthony Sottile.

.. bpo: 37689 .. date: 2019-07-27-18-00-43 .. nonce: glEmZi .. section: Library

Add :meth:is_relative_to in :class:PurePath to determine whether or not one path is relative to another.

.. bpo: 29553 .. date: 2019-07-27-10-14-45 .. nonce: TVeIDe .. section: Library

Fixed :meth:argparse.ArgumentParser.format_usage for mutually exclusive groups. Patch by Andrew Nester.

.. bpo: 37691 .. date: 2019-07-26-22-30-01 .. nonce: 1Li3rx .. section: Library

Let math.dist() accept coordinates as sequences (or iterables) rather than just tuples.

.. bpo: 37685 .. date: 2019-07-26-00-12-29 .. nonce: TqckMZ .. section: Library

Fixed __eq__, __lt__ etc implementations in some classes. They now return :data:NotImplemented for unsupported type of the other operand. This allows the other operand to play role (for example the equality comparison with :data:~unittest.mock.ANY will return True).

.. bpo: 37354 .. date: 2019-07-25-10-28-40 .. nonce: RT3_3H .. section: Library

Make Activate.ps1 Powershell script static to allow for signing it.

.. bpo: 37664 .. date: 2019-07-24-18-27-44 .. nonce: o-GYZC .. section: Library

Update wheels bundled with ensurepip (pip 19.2.3 and setuptools 41.2.0)

.. bpo: 37663 .. date: 2019-07-24-14-38-53 .. nonce: h4-9-1 .. section: Library

Bring consistency to venv shell activation scripts by always using VENV_PROMPT.

.. bpo: 37642 .. date: 2019-07-21-20-59-31 .. nonce: L61Bvy .. section: Library

Allowed the pure Python implementation of :class:datetime.timezone to represent sub-minute offsets close to minimum and maximum boundaries, specifically in the ranges (23:59, 24:00) and (-23:59, 24:00). Patch by Ngalim Siregar

.. bpo: 36161 .. date: 2019-07-20-01-17-43 .. nonce: Fzf-f9 .. section: Library

In :mod:posix, use ttyname_r instead of ttyname for thread safety.

.. bpo: 36324 .. date: 2019-07-19-22-44-41 .. nonce: 1VjywS .. section: Library

Make internal attributes for statistics.NormalDist() private.

.. bpo: 37555 .. date: 2019-07-19-20-13-48 .. nonce: S5am28 .. section: Library

Fix NonCallableMock._call_matcher returning tuple instead of _Call object when self._spec_signature exists. Patch by Elizabeth Uselton

.. bpo: 29446 .. date: 2019-07-19-16-06-48 .. nonce: iXGuoi .. section: Library

Make from tkinter import * import only the expected objects.

.. bpo: 16970 .. date: 2019-07-19-01-46-56 .. nonce: GEASf5 .. section: Library

Adding a value error when an invalid value in passed to nargs Patch by Robert Leenders

.. bpo: 34443 .. date: 2019-07-17-11-10-08 .. nonce: OFnGqz .. section: Library

Exceptions from :mod:enum now use the __qualname of the enum class in the exception message instead of the __name__.

.. bpo: 37491 .. date: 2019-07-17-06-54-43 .. nonce: op0aMs .. section: Library

Fix IndexError when parsing email headers with unexpectedly ending bare-quoted string value. Patch by Abhilash Raj.

.. bpo: 37587 .. date: 2019-07-13-16-02-48 .. nonce: fd-1aF .. section: Library

Make json.loads faster for long strings. (Patch by Marco Paolini)

.. bpo: 18378 .. date: 2019-07-13-13-40-12 .. nonce: NHcojp .. section: Library

Recognize "UTF-8" as a valid value for LC_CTYPE in locale._parse_localename.

.. bpo: 37579 .. date: 2019-07-13-10-59-43 .. nonce: B1Tq9i .. section: Library

Return :exc:NotImplemented in Python implementation of __eq__ for :class:~datetime.timedelta and :class:~datetime.time when the other object being compared is not of the same type to match C implementation. Patch by Karthikeyan Singaravelan.

.. bpo: 21478 .. date: 2019-07-10-23-07-11 .. nonce: cCw9rF .. section: Library

Record calls to parent when autospecced object is attached to a mock using :func:unittest.mock.attach_mock. Patch by Karthikeyan Singaravelan.

.. bpo: 37531 .. date: 2019-07-09-19-38-26 .. nonce: GX7s8S .. section: Library

"python3 -m test -jN --timeout=TIMEOUT" now kills a worker process if it runs longer than TIMEOUT seconds.

.. bpo: 37482 .. date: 2019-07-09-11-20-21 .. nonce: auzvev .. section: Library

Fix serialization of display name in originator or destination address fields with both encoded words and special chars.

.. bpo: 36993 .. date: 2019-07-09-05-44-39 .. nonce: 4javqu .. section: Library

Improve error reporting for corrupt zip files with bad zip64 extra data. Patch by Daniel Hillier.

.. bpo: 37502 .. date: 2019-07-08-03-15-04 .. nonce: qZGC4g .. section: Library

pickle.loads() no longer raises TypeError when the buffers argument is set to None

.. bpo: 37520 .. date: 2019-07-07-21-09-08 .. nonce: Gg0KD6 .. section: Library

Correct behavior for zipfile.Path.parent when the path object identifies a subdirectory.

.. bpo: 18374 .. date: 2019-07-05-21-46-45 .. nonce: qgE0H3 .. section: Library

Fix the .col_offset attribute of nested :class:ast.BinOp instances which had a too large value in some situations.

.. bpo: 37424 .. date: 2019-07-04-13-00-20 .. nonce: 0i1MR- .. section: Library

Fixes a possible hang when using a timeout on subprocess.run() while capturing output. If the child process spawned its own children or otherwise connected its stdout or stderr handles with another process, we could hang after the timeout was reached and our child was killed when attempting to read final output from the pipes.

.. bpo: 37421 .. date: 2019-07-03-12-47-52 .. nonce: gR5hC8 .. section: Library

Fix :func:multiprocessing.util.get_temp_dir finalizer: clear also the 'tempdir' configuration of the current process, so next call to get_temp_dir() will create a new temporary directory, rather than reusing the removed temporary directory.

.. bpo: 37481 .. date: 2019-07-02-13-08-30 .. nonce: hd5k09 .. section: Library

The distutils bdist_wininst command is deprecated in Python 3.8, use bdist_wheel (wheel packages) instead.

.. bpo: 37479 .. date: 2019-07-02-12-43-57 .. nonce: O53a5S .. section: Library

When Enum.__str__ is overridden in a derived class, the override will be used by Enum.__format__ regardless of whether mixin classes are present.

.. bpo: 37440 .. date: 2019-06-28-16-40-17 .. nonce: t3wX-N .. section: Library

http.client now enables TLS 1.3 post-handshake authentication for default context or if a cert_file is passed to HTTPSConnection.

.. bpo: 37437 .. date: 2019-06-27-20-33-50 .. nonce: du39_A .. section: Library

Update vendorized expat version to 2.2.7.

.. bpo: 37428 .. date: 2019-06-27-13-27-02 .. nonce: _wcwUd .. section: Library

SSLContext.post_handshake_auth = True no longer sets SSL_VERIFY_POST_HANDSHAKE verify flag for client connections. Although the option is documented as ignored for clients, OpenSSL implicitly enables cert chain validation when the flag is set.

.. bpo: 37420 .. date: 2019-06-26-22-25-05 .. nonce: CxFJ09 .. section: Library

:func:os.sched_setaffinity now correctly handles errors that arise during iteration over its mask argument. Patch by Brandt Bucher.

.. bpo: 37412 .. date: 2019-06-26-16-28-59 .. nonce: lx0VjC .. section: Library

The :func:os.getcwdb function now uses the UTF-8 encoding on Windows, rather than the ANSI code page: see :pep:529 for the rationale. The function is no longer deprecated on Windows.

.. bpo: 37406 .. date: 2019-06-26-03-00-06 .. nonce: uovkpq .. section: Library

The sqlite3 module now raises TypeError, rather than ValueError, if operation argument type is not str: execute(), executemany() and calling a connection.

.. bpo: 29412 .. date: 2019-06-25-19-27-25 .. nonce: n4Zqdh .. section: Library

Fix IndexError in parsing a header value ending unexpectedly. Patch by Abhilash Raj.

.. bpo: 36546 .. date: 2019-06-25-05-07-48 .. nonce: RUcxaK .. section: Library

The dist argument for statistics.quantiles() is now positional only. The current name doesn't reflect that the argument can be either a dataset or a distribution. Marking the parameter as positional avoids confusion and makes it possible to change the name later.

.. bpo: 37394 .. date: 2019-06-25-02-10-00 .. nonce: srZ1zx .. section: Library

Fix a bug that was causing the :mod:queue module to fail if the accelerator module was not available. Patch by Pablo Galindo.

.. bpo: 37376 .. date: 2019-06-24-11-26-34 .. nonce: SwSUQ4 .. section: Library

:mod:pprint now has support for :class:types.SimpleNamespace. Patch by Carl Bordum Hansen.

.. bpo: 26967 .. date: 2019-06-23-12-46-10 .. nonce: xEuem1 .. section: Library

An :class:~argparse.ArgumentParser with allow_abbrev=False no longer disables grouping of short flags, such as -vv, but only disables abbreviation of long flags as documented. Patch by Zac Hatfield-Dodds.

.. bpo: 37212 .. date: 2019-06-22-22-00-35 .. nonce: Zhv-tq .. section: Library

:func:unittest.mock.call now preserves the order of keyword arguments in repr output. Patch by Karthikeyan Singaravelan.

.. bpo: 37372 .. date: 2019-06-22-12-30-00 .. nonce: kIKqZ6 .. section: Library

Fix error unpickling datetime.time objects from Python 2 with seconds>=24. Patch by Justin Blanchard.

.. bpo: 37345 .. date: 2019-06-22-08-51-44 .. nonce: o8XABX .. section: Library

Add formal support for UDPLITE sockets. Support was present before, but it is now easier to detect support with hasattr(socket, 'IPPROTO_UDPLITE') and there are constants defined for each of the values needed: socket.IPPROTO_UDPLITE, UDPLITE_SEND_CSCOV, and UDPLITE_RECV_CSCOV. Patch by Gabe Appleton.

.. bpo: 37358 .. date: 2019-06-21-14-54-02 .. nonce: RsASpn .. section: Library

Optimized functools.partial by using vectorcall.

.. bpo: 37347 .. date: 2019-06-20-14-23-48 .. nonce: Gf9yYI .. section: Library

:meth:sqlite3.Connection.create_aggregate, :meth:sqlite3.Connection.create_function, :meth:sqlite3.Connection.set_authorizer, :meth:sqlite3.Connection.set_progress_handler :meth:sqlite3.Connection.set_trace_callback methods lead to segfaults if some of these methods are called twice with an equal object but not the same. Now callbacks are stored more carefully. Patch by Aleksandr Balezin.

.. bpo: 37163 .. date: 2019-06-19-10-35-53 .. nonce: 9pPg2F .. section: Library

The obj argument of :func:dataclasses.replace is positional-only now.

.. bpo: 37085 .. date: 2019-06-18-16-29-31 .. nonce: GeYaD6 .. section: Library

Add the optional Linux SocketCAN Broadcast Manager constants, used as flags to configure the BCM behaviour, in the socket module. Patch by Karl Ding.

.. bpo: 37328 .. date: 2019-06-18-15-31-33 .. nonce: 2PW1-l .. section: Library

HTMLParser.unescape is removed. It was undocumented and deprecated since Python 3.4.

.. bpo: 37305 .. date: 2019-06-18-13-59-55 .. nonce: fGzWlP .. section: Library

Add .webmanifest -> application/manifest+json to list of recognized file types and content type headers

.. bpo: 37320 .. date: 2019-06-17-22-10-37 .. nonce: ffieYa .. section: Library

aifc.openfp() alias to aifc.open(), sunau.openfp() alias to sunau.open(), and wave.openfp() alias to wave.open() have been removed. They were deprecated since Python 3.7.

.. bpo: 37315 .. date: 2019-06-17-11-59-52 .. nonce: o1xFC0 .. section: Library

Deprecated accepting floats with integral value (like 5.0) in :func:math.factorial.

.. bpo: 37312 .. date: 2019-06-17-10-03-52 .. nonce: qKvBfF .. section: Library

_dummy_thread and dummy_threading modules have been removed. These modules were deprecated since Python 3.7 which requires threading support.

.. bpo: 33972 .. date: 2019-06-15-14-39-50 .. nonce: XxnNPw .. section: Library

Email with single part but content-type set to multipart/* doesn't raise AttributeError anymore.

.. bpo: 37280 .. date: 2019-06-14-13-30-47 .. nonce: Fxur0F .. section: Library

Use threadpool for reading from file for sendfile fallback mode.

.. bpo: 37279 .. date: 2019-06-14-13-25-56 .. nonce: OHlW6l .. section: Library

Fix asyncio sendfile support when sendfile sends extra data in fallback mode.

.. bpo: 19865 .. date: 2019-06-14-08-30-16 .. nonce: FRGH4I .. section: Library

:func:ctypes.create_unicode_buffer now also supports non-BMP characters on platforms with 16-bit :c:type:wchar_t (for example, Windows and AIX).

.. bpo: 37266 .. date: 2019-06-13-11-59-52 .. nonce: goLjef .. section: Library

In a subinterpreter, spawning a daemon thread now raises an exception. Daemon threads were never supported in subinterpreters. Previously, the subinterpreter finalization crashed with a Python fatal error if a daemon thread was still running.

.. bpo: 37210 .. date: 2019-06-12-16-10-50 .. nonce: r4yMg6 .. section: Library

Allow pure Python implementation of :mod:pickle to work even when the C :mod:!_pickle module is unavailable.

.. bpo: 21872 .. date: 2019-06-12-08-56-22 .. nonce: V9QGGN .. section: Library

Fix :mod:lzma: module decompresses data incompletely. When decompressing a FORMAT_ALONE format file, and it doesn't have the end marker, sometimes the last one to dozens bytes can't be output. Patch by Ma Lin.

.. bpo: 35922 .. date: 2019-06-11-19-34-29 .. nonce: rxpzWr .. section: Library

Fix :meth:RobotFileParser.crawl_delay and :meth:RobotFileParser.request_rate to return None rather than raise :exc:AttributeError when no relevant rule is defined in the robots.txt file. Patch by Rémi Lapeyre.

.. bpo: 35766 .. date: 2019-06-11-16-41-40 .. nonce: v1Kj-T .. section: Library

Change the format of feature_version to be a (major, minor) tuple.

.. bpo: 36607 .. date: 2019-06-11-13-52-04 .. nonce: 5_mJkQ .. section: Library

Eliminate :exc:RuntimeError raised by :func:asyncio.all_tasks if internal tasks weak set is changed by another thread during iteration.

.. bpo: 18748 .. date: 2019-06-11-01-54-19 .. nonce: ADqCkq .. section: Library

:class:!_pyio.IOBase destructor now does nothing if getting the closed attribute fails to better mimic :class:!_io.IOBase finalizer.

.. bpo: 36402 .. date: 2019-06-11-00-35-02 .. nonce: b0IJVp .. section: Library

Fix a race condition at Python shutdown when waiting for threads. Wait until the Python thread state of all non-daemon threads get deleted (join all non-daemon threads), rather than just wait until non-daemon Python threads complete.

.. bpo: 37206 .. date: 2019-06-09-22-25-03 .. nonce: 2WBg4q .. section: Library

Default values which cannot be represented as Python objects no longer improperly represented as None in function signatures.

.. bpo: 37111 .. date: 2019-06-09-17-22-33 .. nonce: 2I0z2k .. section: Library

Added encoding and errors keyword parameters to logging.basicConfig.

.. bpo: 12144 .. date: 2019-06-08-23-26-58 .. nonce: Z7mz-q .. section: Library

Ensure cookies with expires attribute are handled in :meth:CookieJar.make_cookies.

.. bpo: 34886 .. date: 2019-06-08-16-03-19 .. nonce: Ov-pc9 .. section: Library

Fix an unintended ValueError from :func:subprocess.run when checking for conflicting input and stdin or capture_output and stdout or stderr args when they were explicitly provided but with None values within a passed in **kwargs dict rather than as passed directly by name. Patch contributed by Rémi Lapeyre.

.. bpo: 37173 .. date: 2019-06-08-11-33-48 .. nonce: 0e_8gS .. section: Library

The exception message for inspect.getfile() now correctly reports the passed class rather than the builtins module.

.. bpo: 37178 .. date: 2019-06-07-17-16-09 .. nonce: Day_oB .. section: Library

Give math.perm() a one argument form that means the same as math.factorial().

.. bpo: 37178 .. date: 2019-06-07-17-11-34 .. nonce: b1StSv .. section: Library

For math.perm(n, k), let k default to n, giving the same result as factorial.

.. bpo: 37165 .. date: 2019-06-05-11-48-19 .. nonce: V_rwfE .. section: Library

Converted _collections._count_elements to use the Argument Clinic.

.. bpo: 34767 .. date: 2019-06-04-23-44-52 .. nonce: BpDShN .. section: Library

Do not always create a :class:collections.deque in :class:asyncio.Lock.

.. bpo: 37158 .. date: 2019-06-04-22-25-38 .. nonce: JKm15S .. section: Library

Speed-up statistics.fmean() by switching from a function to a generator.

.. bpo: 34282 .. date: 2019-06-04-15-39-14 .. nonce: aAK54n .. section: Library

Remove Enum._convert method, deprecated in 3.8.

.. bpo: 37150 .. date: 2019-06-04-14-44-41 .. nonce: TTzHxj .. section: Library

argparse._ActionsContainer.add_argument now throws error, if someone accidentally pass FileType class object instead of instance of FileType as type argument.

.. bpo: 28724 .. date: 2019-05-30-15-51-42 .. nonce: 34TrS8 .. section: Library

The socket module now has the :func:socket.send_fds and :func:socket.recv.fds methods. Contributed by Joannah Nanjekye, Shinya Okano and Victor Stinner.

.. bpo: 35621 .. date: 2019-05-28-19-03-46 .. nonce: Abc1lf .. section: Library

Support running asyncio subprocesses when execution event loop in a thread on UNIX.

.. bpo: 36520 .. date: 2019-05-28-02-37-00 .. nonce: W4tday .. section: Library

Lengthy email headers with UTF-8 characters are now properly encoded when they are folded. Patch by Jeffrey Kintscher.

.. bpo: 30835 .. date: 2019-05-27-15-29-46 .. nonce: 3FoaWH .. section: Library

Fixed a bug in email parsing where a message with invalid bytes in content-transfer-encoding of a multipart message can cause an AttributeError. Patch by Andrew Donnellan.

.. bpo: 31163 .. date: 2019-05-26-16-34-53 .. nonce: 21A802 .. section: Library

pathlib.Path instance's rename and replace methods now return the new Path instance.

.. bpo: 25068 .. date: 2019-05-22-04-52-35 .. nonce: vR_rC- .. section: Library

:class:urllib.request.ProxyHandler now lowercases the keys of the passed dictionary.

.. bpo: 26185 .. date: 2019-05-20-14-17-29 .. nonce: pQW4mI .. section: Library

Fix :func:repr on empty :class:ZipInfo object. Patch by Mickaël Schoentgen.

.. bpo: 21315 .. date: 2019-05-19-10-48-46 .. nonce: PgXVqF .. section: Library

Email headers containing RFC2047 encoded words are parsed despite the missing whitespace, and a defect registered. Also missing trailing whitespace after encoded words is now registered as a defect.

.. bpo: 31904 .. date: 2019-05-17-16-50-02 .. nonce: 4a5ggm .. section: Library

Port test_datetime to VxWorks: skip zoneinfo tests on VxWorks

.. bpo: 35805 .. date: 2019-05-17-15-11-08 .. nonce: E4YwYz .. section: Library

Add parser for Message-ID header and add it to default HeaderRegistry. This should prevent folding of Message-ID using RFC 2048 encoded words.

.. bpo: 36871 .. date: 2019-05-12-12-58-37 .. nonce: 6xiEHZ .. section: Library

Ensure method signature is used instead of constructor signature of a class while asserting mock object against method calls. Patch by Karthikeyan Singaravelan.

.. bpo: 35070 .. date: 2019-05-09-18-50-55 .. nonce: 4vaqNL .. section: Library

posix.getgrouplist() now works correctly when the user belongs to NGROUPS_MAX supplemental groups. Patch by Jeffrey Kintscher.

.. bpo: 31783 .. date: 2019-05-07-19-25-55 .. nonce: lgLo69 .. section: Library

Fix race condition in ThreadPoolExecutor when worker threads are created during interpreter shutdown.

.. bpo: 36582 .. date: 2019-05-07-17-42-36 .. nonce: L_dxR6 .. section: Library

Fix UserString.encode() to correctly return bytes rather than a UserString instance.

.. bpo: 32424 .. date: 2019-04-28-10-34-19 .. nonce: eqNPhM .. section: Library

Deprecate xml.etree.ElementTree.Element.copy() in favor of copy.copy().

Patch by Gordon P. Hemsley

.. bpo: 36564 .. date: 2019-04-08-13-00-13 .. nonce: n67m .. section: Library

Fix infinite loop in email header folding logic that would be triggered when an email policy's max_line_length is not long enough to include the required markup and any values in the message. Patch by Paul Ganssle

.. bpo: 36543 .. date: 2019-04-06-20-08-12 .. nonce: RPjmUz .. section: Library

Removed methods Element.getchildren(), Element.getiterator() and ElementTree.getiterator() and the xml.etree.cElementTree module.

.. bpo: 36409 .. date: 2019-03-23-16-42-46 .. nonce: ZYVKao .. section: Library

Remove the old plistlib API deprecated in Python 3.4

.. bpo: 36302 .. date: 2019-03-21-19-23-46 .. nonce: Yc591g .. section: Library

distutils sorts source file lists so that Extension .so files build more reproducibly by default

.. bpo: 36250 .. date: 2019-03-09-16-04-12 .. nonce: tSK4N1 .. section: Library

Ignore ValueError from signal with interaction in non-main thread.

.. bpo: 36046 .. date: 2019-02-19-17-32-45 .. nonce: fX9OPj .. section: Library

Added user, group and extra_groups parameters to the subprocess.Popen constructor. Patch by Patrick McLean.

.. bpo: 32627 .. date: 2019-02-03-19-13-08 .. nonce: b68f64 .. section: Library

Fix compile error when _uuid headers conflicting included.

.. bpo: 35800 .. date: 2019-01-25-17-12-17 .. nonce: MCGJdQ .. section: Library

Deprecate smtpd.MailmanProxy ready for future removal.

.. bpo: 35168 .. date: 2019-01-22-09-23-20 .. nonce: UGv2yW .. section: Library

:attr:shlex.shlex.punctuation_chars is now a read-only property.

.. bpo: 8538 .. date: 2019-01-09-16-18-52 .. nonce: PfVZia .. section: Library

Add support for boolean actions like --foo and --no-foo to argparse. Patch contributed by Rémi Lapeyre.

.. bpo: 20504 .. date: 2018-11-21-18-05-50 .. nonce: kG0ub5 .. section: Library

Fixes a bug in :mod:!cgi module when a multipart/form-data request has no Content-Length header.

.. bpo: 25988 .. date: 2018-11-19-10-23-58 .. nonce: 6o7gGK .. section: Library

The abstract base classes in :mod:collections.abc no longer are exposed in the regular :mod:collections module.

.. bpo: 11122 .. date: 2018-11-12-19-08-50 .. nonce: Gj7BQn .. section: Library

Distutils won't check for rpmbuild in specified paths only.

.. bpo: 34775 .. date: 2018-09-23-03-18-52 .. nonce: vHeuHk .. section: Library

Division handling of PurePath now returns NotImplemented instead of raising a TypeError when passed something other than an instance of str or PurePath. Patch by Roger Aiudi.

.. bpo: 34749 .. date: 2018-09-21-13-23-29 .. nonce: B0k819 .. section: Library

:func:binascii.a2b_base64 is now up to 2 times faster. Patch by Sergey Fedoseev.

.. bpo: 34519 .. date: 2018-08-27-15-44-50 .. nonce: cPlH1h .. section: Library

Add additional aliases for HP Roman 8. Patch by Michael Osipov.

.. bpo: 28009 .. date: 2018-08-04-12-26-11 .. nonce: 4JcHZb .. section: Library

Fix uuid.getnode() on platforms with '.' as MAC Addr delimiter as well fix for MAC Addr format that omits a leading 0 in MAC Addr values. Currently, AIX is the only know platform with these settings. Patch by Michael Felt.

.. bpo: 30618 .. date: 2018-07-14-13-48-56 .. nonce: T5AUF6 .. section: Library

Add :meth:~pathlib.Path.readlink. Patch by Girts Folkmanis.

.. bpo: 32498 .. date: 2018-06-17-21-02-25 .. nonce: La3TZz .. section: Library

Made :func:urllib.parse.unquote accept bytes in addition to strings. Patch by Stein Karlsen.

.. bpo: 33348 .. date: 2018-04-24-13-18-48 .. nonce: XaJDei .. section: Library

lib2to3 now recognizes expressions after * and ** like in f(*[] or []).

.. bpo: 32689 .. date: 2018-02-13-17-58-30 .. nonce: a-3SnH .. section: Library

Update :func:shutil.move function to allow for Path objects to be used as source argument. Patch by Emily Morehouse and Maxwell "5.13b" McKinnon.

.. bpo: 32820 .. date: 2018-02-13-12-25-43 .. nonce: 0stF0u .. section: Library

Added __format__ to IPv4 and IPv6 classes. Always outputs a fully zero-padded string. Supports b/x/n modifiers (bin/hex/native format). Native format for IPv4 is bin, native format for IPv6 is hex. Also supports '#' and '_' modifiers.

.. bpo: 27657 .. date: 2017-12-26-14-32-23 .. nonce: 6BhyVK .. section: Library

Fix urllib.parse.urlparse() with numeric paths. A string like "path:80" is no longer parsed as a path but as a scheme ("path") and a path ("80").

.. bpo: 4963 .. date: 2017-08-15-11-24-41 .. nonce: LRYres .. section: Library

Fixed non-deterministic behavior related to mimetypes extension mapping and module reinitialization.

.. bpo: 21767 .. date: 2019-11-17-11-54-57 .. nonce: Qq3Dos .. section: Documentation

Explicitly mention abc support in functools.singledispatch

.. bpo: 38816 .. date: 2019-11-15-11-39-13 .. nonce: vUaSVL .. section: Documentation

Provides more details about the interaction between :c:func:fork and CPython's runtime, focusing just on the C-API. This includes cautions about where :c:func:fork should and shouldn't be called.

.. bpo: 38351 .. date: 2019-11-15-09-22-28 .. nonce: xwhlse .. section: Documentation

Modernize :mod:email examples from %-formatting to f-strings.

.. bpo: 38778 .. date: 2019-11-12-15-31-09 .. nonce: PHhTlv .. section: Documentation

Document the fact that :exc:RuntimeError is raised if :meth:os.fork is called in a subinterpreter.

.. bpo: 38592 .. date: 2019-10-26-13-19-07 .. nonce: Y96BYO .. section: Documentation

Add Brazilian Portuguese to the language switcher at Python Documentation website.

.. bpo: 38294 .. date: 2019-09-27-23-37-41 .. nonce: go_jFf .. section: Documentation

Add list of no-longer-escaped chars to re.escape documentation

.. bpo: 38053 .. date: 2019-09-07-19-09-01 .. nonce: lttibE .. section: Documentation

Modernized the plistlib documentation

.. bpo: 26868 .. date: 2019-09-07-15-55-46 .. nonce: Raw0Gd .. section: Documentation

Fix example usage of :c:func:PyModule_AddObject to properly handle errors.

.. bpo: 36797 .. date: 2019-09-05-14-47-51 .. nonce: KN9Ga5 .. section: Documentation

Fix a dead link in the distutils API Reference.

.. bpo: 37977 .. date: 2019-08-29-14-38-01 .. nonce: pML-UI .. section: Documentation

Warn more strongly and clearly about pickle insecurity

.. bpo: 37979 .. date: 2019-08-29-10-40-05 .. nonce: TAUx_E .. section: Documentation

Added a link to dateutil.parser.isoparse in the datetime.fromisoformat documentation. Patch by Paul Ganssle

.. bpo: 12707 .. date: 2019-08-27-01-14-59 .. nonce: Yj3_7_ .. section: Documentation

Deprecate info(), geturl(), getcode() methods in favor of the headers, url, and status properties, respectively, for HTTPResponse and addinfourl. Also deprecate the code attribute of addinfourl in favor of the status attribute. Patch by Ashwin Ramaswami

.. bpo: 37937 .. date: 2019-08-24-12-59-06 .. nonce: F7fHbt .. section: Documentation

Mention frame.f_trace in :func:sys.settrace docs.

.. bpo: 37878 .. date: 2019-08-16-20-01-10 .. nonce: MvA6rZ .. section: Documentation

Make :c:func:PyThreadState_DeleteCurrent Internal.

.. bpo: 37759 .. date: 2019-08-04-19-20-58 .. nonce: EHRF4i .. section: Documentation

Beginning edits to Whatsnew 3.8

.. bpo: 37726 .. date: 2019-07-31-11-40-06 .. nonce: h-3o9a .. section: Documentation

Stop recommending getopt in the tutorial for command line argument parsing and promote argparse.

.. bpo: 32910 .. date: 2019-07-25-10-30-32 .. nonce: caLLAe .. section: Documentation

Remove implementation-specific behaviour of how venv's Deactivate works.

.. bpo: 37256 .. date: 2019-07-16-14-48-12 .. nonce: qJTrBb .. section: Documentation

Fix wording of arguments for :class:Request in :mod:urllib.request

.. bpo: 37284 .. date: 2019-07-13-12-58-20 .. nonce: rP8WpB .. section: Documentation

Add a brief note to indicate that any new sys.implementation required attributes must go through the PEP process.

.. bpo: 30088 .. date: 2019-07-13-12-43-01 .. nonce: CIcBjy .. section: Documentation

Documented that :class:mailbox.Maildir constructor doesn't attempt to verify the maildir folder layout correctness. Patch by Sviatoslav Sydorenko.

.. bpo: 37521 .. date: 2019-07-12-15-09-56 .. nonce: 7tiFR- .. section: Documentation

Fix importlib examples to insert any newly created modules via importlib.util.module_from_spec() immediately into sys.modules instead of after calling loader.exec_module().

Thanks to Benjamin Mintz for finding the bug.

.. bpo: 37456 .. date: 2019-07-06-17-51-36 .. nonce: lgAQHn .. section: Documentation

Slash ('/') is now part of syntax.

.. bpo: 37487 .. date: 2019-07-06-17-19-26 .. nonce: QagfZ5 .. section: Documentation

Fix PyList_GetItem index description to include 0.

.. bpo: 37149 .. date: 2019-07-06-02-19-02 .. nonce: NumHn3 .. section: Documentation

Replace the dead link to the Tkinter 8.5 reference by John Shipman, New Mexico Tech, with a link to the archive.org copy.

.. bpo: 37478 .. date: 2019-07-06-00-57-27 .. nonce: B0ioLw .. section: Documentation

Added possible exceptions to the description of os.chdir().

.. bpo: 34903 .. date: 2019-06-17-09-36-46 .. nonce: r_wGRc .. section: Documentation

Documented that in :meth:datetime.datetime.strptime, the leading zero in some two-digit formats is optional. Patch by Mike Gleen.

.. bpo: 36260 .. date: 2019-06-04-09-29-00 .. nonce: WrGuc- .. section: Documentation

Add decompression pitfalls to zipfile module documentation.

.. bpo: 37004 .. date: 2019-05-22-04-30-07 .. nonce: BRgxrt .. section: Documentation

In the documentation for difflib, a note was added explicitly warning that the results of SequenceMatcher's ratio method may depend on the order of the input strings.

.. bpo: 36960 .. date: 2019-05-18-16-25-44 .. nonce: xEKHXj .. section: Documentation

Restructured the :mod:datetime docs in the interest of making them more user-friendly and improving readability. Patch by Brad Solomon.

.. bpo: 36487 .. date: 2019-04-02-19-23-00 .. nonce: Jg6-MG .. section: Documentation

Make C-API docs clear about what the "main" interpreter is.

.. bpo: 23460 .. date: 2019-02-14-07-12-48 .. nonce: Iqiqtm .. section: Documentation

The documentation for decimal string formatting using the :g specifier has been updated to reflect the correct exponential notation cutoff point. Original patch contributed by Tuomas Suutari.

.. bpo: 35803 .. date: 2019-01-21-14-30-59 .. nonce: yae6Lq .. section: Documentation

Document and test that tempfile functions may accept a :term:path-like object for the dir argument. Patch by Anthony Sottile.

.. bpo: 33944 .. date: 2018-10-26-18-10-29 .. nonce: V1YeOA .. section: Documentation

Added a note about the intended use of code in .pth files.

.. bpo: 34293 .. date: 2018-07-31-15-38-26 .. nonce: yHupAL .. section: Documentation

Fix the Doc/Makefile regarding PAPER environment variable and PDF builds

.. bpo: 25237 .. date: 2018-06-02-12-55-23 .. nonce: m8-JMu .. section: Documentation

Add documentation for tkinter modules

.. bpo: 38614 .. date: 2019-10-30-15-12-32 .. nonce: M6UnLB .. section: Tests

Fix test_communicate() of test_asyncio.test_subprocess: use support.LONG_TIMEOUT (5 minutes), instead of just 1 minute.

.. bpo: 38614 .. date: 2019-10-28-15-56-02 .. nonce: aDdDYE .. section: Tests

Add timeout constants to :mod:test.support: :data:~test.support.LOOPBACK_TIMEOUT, :data:~test.support.INTERNET_TIMEOUT, :data:~test.support.SHORT_TIMEOUT and :data:~test.support.LONG_TIMEOUT.

.. bpo: 38502 .. date: 2019-10-17-00-49-38 .. nonce: vUEic7 .. section: Tests

test.regrtest now uses process groups in the multiprocessing mode (-jN command line option) if process groups are available: if :func:os.setsid and :func:os.killpg functions are available.

.. bpo: 35998 .. date: 2019-10-16-01-36-15 .. nonce: G305Bf .. section: Tests

Fix a race condition in test_asyncio.test_start_tls_server_1(). Previously, there was a race condition between the test main() function which replaces the protocol and the test ServerProto protocol which sends ANSWER once it gets HELLO. Now, only the test main() function is responsible to send data, ServerProto no longer sends data.

.. bpo: 38470 .. date: 2019-10-14-22-46-35 .. nonce: NHtzpy .. section: Tests

Fix test_compileall.test_compile_dir_maxlevels() on Windows without long path support: only create 3 subdirectories instead of between 20 and 100 subdirectories.

.. bpo: 37531 .. date: 2019-10-08-16-42-05 .. nonce: 7v-_Ca .. section: Tests

On timeout, regrtest no longer attempts to call popen.communicate() again: it can hang until all child processes using stdout and stderr pipes completes. Kill the worker process and ignores its output. Change also the faulthandler timeout of the main process from 1 minute to 5 minutes, for Python slowest buildbots.

.. bpo: 38239 .. date: 2019-09-26-15-48-36 .. nonce: MfoVzY .. section: Tests

Fix test_gdb for Link Time Optimization (LTO) builds.

.. bpo: 38275 .. date: 2019-09-25-14-40-57 .. nonce: -kdveI .. section: Tests

test_ssl now handles disabled TLS/SSL versions better. OpenSSL's crypto policy and run-time settings are recognized and tests for disabled versions are skipped. Tests also accept more TLS minimum_versions for platforms that override OpenSSL's default with strict settings.

.. bpo: 38271 .. date: 2019-09-25-13-11-29 .. nonce: iHXNIg .. section: Tests

The private keys for test_ssl were encrypted with 3DES in traditional PKCS#5 format. 3DES and the digest algorithm of PKCS#5 are blocked by some strict crypto policies. Use PKCS#8 format with AES256 encryption instead.

.. bpo: 38270 .. date: 2019-09-25-12-18-31 .. nonce: _x-9uH .. section: Tests

test.support now has a helper function to check for availability of a hash digest function. Several tests are refactored avoid MD5 and use SHA256 instead. Other tests are marked to use MD5 and skipped when MD5 is disabled.

.. bpo: 37123 .. date: 2019-09-24-12-30-55 .. nonce: IoutBn .. section: Tests

Multiprocessing test test_mymanager() now also expects -SIGTERM, not only exitcode 0. BaseManager._finalize_manager() sends SIGTERM to the manager process if it takes longer than 1 second to stop, which happens on slow buildbots.

.. bpo: 38212 .. date: 2019-09-24-12-24-05 .. nonce: IWbhWz .. section: Tests

Multiprocessing tests: increase test_queue_feeder_donot_stop_onexc() timeout from 1 to 60 seconds.

.. bpo: 38117 .. date: 2019-09-11-17-22-32 .. nonce: X7LgGY .. section: Tests

Test with OpenSSL 1.1.1d

.. bpo: 38018 .. date: 2019-09-03-19-33-10 .. nonce: zTrMu7 .. section: Tests

Increase code coverage for multiprocessing.shared_memory.

.. bpo: 37805 .. date: 2019-08-25-19-51-46 .. nonce: Kl1sti .. section: Tests

Add tests for json.dump(..., skipkeys=True). Patch by Donghee Na.

.. bpo: 37531 .. date: 2019-08-20-19-24-19 .. nonce: wRoXfU .. section: Tests

Enhance regrtest multiprocess timeout: write a message when killing a worker process, catch popen.kill() and popen.wait() exceptions, put a timeout on the second call to popen.communicate().

.. bpo: 37876 .. date: 2019-08-16-16-15-14 .. nonce: m3k1w3 .. section: Tests

Add tests for ROT-13 codec.

.. bpo: 36833 .. date: 2019-07-18-14-52-58 .. nonce: Zoe9ek .. section: Tests

Added tests for :samp:PyDateTime_{xxx}_GET_{xxx}() macros of the C API of the :mod:datetime module. Patch by Joannah Nanjekye.

.. bpo: 37558 .. date: 2019-07-11-10-33-56 .. nonce: SKHRsL .. section: Tests

Fix test_shared_memory_cleaned_after_process_termination name handling

.. bpo: 37526 .. date: 2019-07-09-12-33-18 .. nonce: vmm5y7 .. section: Tests

Add :func:test.support.catch_threading_exception: context manager catching :class:threading.Thread exception using :func:threading.excepthook.

.. bpo: 37421 .. date: 2019-07-08-10-11-36 .. nonce: OY77go .. section: Tests

test_concurrent_futures now explicitly stops the ForkServer instance if it's running.

.. bpo: 37421 .. date: 2019-07-05-14-47-55 .. nonce: n8o2to .. section: Tests

multiprocessing tests now stop the ForkServer instance if it's running: close the "alive" file descriptor to ask the server to stop and then remove its UNIX address.

.. bpo: 37421 .. date: 2019-07-03-00-05-28 .. nonce: ORGRSG .. section: Tests

test_distutils.test_build_ext() is now able to remove the temporary directory on Windows: don't import the newly built C extension ("xx") in the current process, but test it in a separated process.

.. bpo: 37421 .. date: 2019-07-02-23-29-06 .. nonce: WEfc5A .. section: Tests

test_concurrent_futures now cleans up multiprocessing to remove immediately temporary directories created by multiprocessing.util.get_temp_dir().

.. bpo: 37421 .. date: 2019-07-02-23-20-35 .. nonce: HCkKWz .. section: Tests

test_winconsoleio doesn't leak a temporary file anymore: use tempfile.TemporaryFile() to remove it when the test completes.

.. bpo: 37421 .. date: 2019-07-01-19-57-26 .. nonce: NFH1f0 .. section: Tests

multiprocessing tests now explicitly call _run_finalizers() to immediately remove temporary directories created by tests.

.. bpo: 37421 .. date: 2019-07-01-19-56-17 .. nonce: bOe350 .. section: Tests

urllib.request tests now call :func:~urllib.request.urlcleanup to remove temporary files created by urlretrieve() tests and to clear the _opener global variable set by urlopen() and functions calling indirectly urlopen().

.. bpo: 37472 .. date: 2019-07-01-17-19-47 .. nonce: WzkEAx .. section: Tests

Remove Lib/test/outstanding_bugs.py.

.. bpo: 37199 .. date: 2019-06-29-23-56-28 .. nonce: FHDsLf .. section: Tests

Fix test failures when IPv6 is unavailable or disabled.

.. bpo: 19696 .. date: 2019-06-29-16-02-21 .. nonce: 05ijhN .. section: Tests

Replace deprecated method "random.choose" with "random.choice" in "test_pkg_import.py".

.. bpo: 37335 .. date: 2019-06-28-16-37-52 .. nonce: o5S2hY .. section: Tests

Remove no longer necessary code from c locale coercion tests

.. bpo: 37421 .. date: 2019-06-27-00-37-59 .. nonce: rVJb3x .. section: Tests

Fix test_shutil to no longer leak temporary files.

.. bpo: 37411 .. date: 2019-06-26-15-28-45 .. nonce: 5lGNhM .. section: Tests

Fix test_wsgiref.testEnviron() to no longer depend on the environment variables (don't fail if "X" variable is set).

.. bpo: 37400 .. date: 2019-06-25-16-02-43 .. nonce: cx_EWv .. section: Tests

Fix test_os.test_chown(): use os.getgroups() rather than grp.getgrall() to get groups. Rename also the test to test_chown_gid().

.. bpo: 37359 .. date: 2019-06-24-10-47-07 .. nonce: CkdtyO .. section: Tests

Add --cleanup option to python3 -m test to remove test_python_* directories of previous failed jobs. Add "make cleantest" to run python3 -m test --cleanup.

.. bpo: 37362 .. date: 2019-06-21-15-47-33 .. nonce: D3xppx .. section: Tests

test_gdb no longer fails if it gets an "unexpected" message on stderr: it now ignores stderr. The purpose of test_gdb is to test that python-gdb.py commands work as expected, not to test gdb.

.. bpo: 35998 .. date: 2019-06-14-17-05-49 .. nonce: yX82oD .. section: Tests

Avoid TimeoutError in test_asyncio: test_start_tls_server_1()

.. bpo: 37278 .. date: 2019-06-14-12-21-47 .. nonce: z0HUOr .. section: Tests

Fix test_asyncio ProactorLoopCtrlC: join the thread to prevent leaking a running thread and leaking a reference.

.. bpo: 37261 .. date: 2019-06-13-12-19-56 .. nonce: NuKFVo .. section: Tests

Fix :func:test.support.catch_unraisable_exception: its exit() method now ignores unraisable exception raised when clearing its unraisable attribute.

.. bpo: 37069 .. date: 2019-06-13-00-46-25 .. nonce: wdktFo .. section: Tests

regrtest now uses :func:sys.unraisablehook to mark a test as "environment altered" (ENV_CHANGED) if it emits an "unraisable exception". Moreover, regrtest logs a warning in this case.

Use python3 -m test --fail-env-changed to catch unraisable exceptions in tests.

.. bpo: 37252 .. date: 2019-06-12-14-30-29 .. nonce: 4o-uLs .. section: Tests

Fix assertions in test_close and test_events_mask_overflow devpoll tests.

.. bpo: 37169 .. date: 2019-06-07-12-23-15 .. nonce: yfXTFg .. section: Tests

Rewrite _PyObject_IsFreed() unit tests.

.. bpo: 37153 .. date: 2019-06-04-18-30-39 .. nonce: 711INB .. section: Tests

test_venv.test_multiprocessing() now explicitly calls pool.terminate() to wait until the pool completes.

.. bpo: 34001 .. date: 2019-06-03-20-47-10 .. nonce: KvYx9z .. section: Tests

Make test_ssl pass with LibreSSL. LibreSSL handles minimum and maximum TLS version differently than OpenSSL.

.. bpo: 36919 .. date: 2019-05-28-15-41-34 .. nonce: -vGt_m .. section: Tests

Make test_source_encoding.test_issue2301 implementation independent. The test will work now for both CPython and IronPython.

.. bpo: 30202 .. date: 2019-04-15-19-05-35 .. nonce: Wt7INj .. section: Tests

Update test.test_importlib.test_abc to test find_spec().

.. bpo: 28009 .. date: 2019-04-11-07-59-43 .. nonce: s85urF .. section: Tests

Modify the test_uuid logic to test when a program is available AND can be used to obtain a MACADDR as basis for an UUID. Patch by M. Felt

.. bpo: 34596 .. date: 2018-09-07-01-18-27 .. nonce: r2-EGd .. section: Tests

Fallback to a default reason when :func:unittest.skip is uncalled. Patch by Naitree Zhu.

.. bpo: 38809 .. date: 2019-11-15-09-25-44 .. nonce: 9jwta6 .. section: Build

On Windows, build scripts will now recognize and use python.exe from an active virtual env.

.. bpo: 38684 .. date: 2019-11-04-14-30-37 .. nonce: aed593 .. section: Build

Fix _hashlib build when Blake2 is disabled, but OpenSSL supports it.

.. bpo: 38468 .. date: 2019-10-13-16-18-24 .. nonce: buCO84 .. section: Build

Misc/python-config.in now uses getvar() for all still existing sysconfig.get_config_var() calls. Patch by Joannah Nanjekye.

.. bpo: 37415 .. date: 2019-10-11-15-32-58 .. nonce: D9RXrq .. section: Build

Fix stdatomic.h header check for ICC compiler: the ICC implementation lacks atomic_uintptr_t type which is needed by Python.

.. bpo: 38301 .. date: 2019-09-28-02-37-11 .. nonce: 123456 .. section: Build

In Solaris family, we must be sure to use -D_REENTRANT. Patch by Jesús Cea Avión.

.. bpo: 36002 .. date: 2019-09-13-14-12-36 .. nonce: Bcl4oe .. section: Build

Locate llvm-profdata and llvm-ar binaries using AC_PATH_TOOL rather than AC_PATH_TARGET_TOOL.

.. bpo: 37936 .. date: 2019-09-10-00-54-48 .. nonce: E7XEwu .. section: Build

The :file:.gitignore file systematically keeps "rooted", with a non-trailing slash, all the rules that are meant to apply to files in a specific place in the repo. Previously, when the intended file to ignore happened to be at the root of the repo, we'd most often accidentally also ignore files and directories with the same name anywhere in the tree.

.. bpo: 37760 .. date: 2019-08-24-17-39-09 .. nonce: f3jXuH .. section: Build

The :file:Tools/unicode/makeunicodedata.py script, which is used for converting information from the Unicode Character Database into generated code and data used by the methods of :class:str and by the :mod:unicodedata module, now handles each character's data as a dataclass with named attributes, rather than a length-18 list of different fields.

.. bpo: 37936 .. date: 2019-08-24-00-29-40 .. nonce: QrORqA .. section: Build

The :file:.gitignore file no longer applies to any files that are in fact tracked in the Git repository. Patch by Greg Price.

.. bpo: 37725 .. date: 2019-07-30-16-26-11 .. nonce: MkG1TT .. section: Build

Change "clean" makefile target to also clean the program guided optimization (PGO) data. Previously you would have to use "make clean" and "make profile-removal", or "make clobber".

.. bpo: 37707 .. date: 2019-07-29-11-36-16 .. nonce: Sm-dGk .. section: Build

Mark some individual tests to skip when --pgo is used. The tests marked increase the PGO task time significantly and likely don't help improve optimization of the final executable.

.. bpo: 36044 .. date: 2019-07-11-01-28-24 .. nonce: gIgfiJ .. section: Build

Reduce the number of unit tests run for the PGO generation task. This speeds up the task by a factor of about 15x. Running the full unit test suite is slow. This change may result in a slightly less optimized build since not as many code branches will be executed. If you are willing to wait for the much slower build, the old behavior can be restored using './configure [..] PROFILE_TASK="-m test --pgo-extended"'. We make no guarantees as to which PGO task set produces a faster build. Users who care should run their own relevant benchmarks as results can depend on the environment, workload, and compiler tool chain.

.. bpo: 37468 .. date: 2019-07-01-14-39-40 .. nonce: trbQ-_ .. section: Build

make install no longer installs wininst-*.exe files used by distutils bdist_wininst: bdist_wininst only works on Windows.

.. bpo: 37189 .. date: 2019-06-17-09-40-59 .. nonce: j5ebdT .. section: Build

Many :samp:PyRun_{XXX}() functions like :c:func:PyRun_String were no longer exported in libpython38.dll by mistake. Export them again to fix the ABI compatibility.

.. bpo: 25361 .. date: 2019-03-19-22-07-37 .. nonce: XO9Bfr .. section: Build

Enables use of SSE2 instructions in Windows 32-bit build.

.. bpo: 36210 .. date: 2019-03-06-18-55-10 .. nonce: fup9H2 .. section: Build

Update optional extension module detection for AIX. ossaudiodev and spwd are not applicable for AIX, and are no longer reported as missing. 3rd-party packaging of ncurses (with ASIS support) conflicts with officially supported AIX curses library, so configure AIX to use libcurses.a. However, skip trying to build _curses_panel.

patch by M Felt

.. bpo: 38589 .. date: 2019-10-28-10-48-16 .. nonce: V69Q1a .. section: Windows

Fixes HTML Help shortcut when Windows is not installed to C drive

.. bpo: 38453 .. date: 2019-10-28-10-32-43 .. nonce: NwwatW .. section: Windows

Ensure ntpath.realpath() correctly resolves relative paths.

.. bpo: 38519 .. date: 2019-10-28-05-01-29 .. nonce: dCkY66 .. section: Windows

Restores the internal C headers that were missing from the nuget.org and Microsoft Store packages.

.. bpo: 38492 .. date: 2019-10-16-09-49-09 .. nonce: Te1LxC .. section: Windows

Remove pythonw.exe dependency on the Microsoft C++ runtime.

.. bpo: 38344 .. date: 2019-10-05-05-50-58 .. nonce: scr2LO .. section: Windows

Fix error message in activate.bat

.. bpo: 38359 .. date: 2019-10-03-08-04-14 .. nonce: wzwsl_ .. section: Windows

Ensures pyw.exe launcher reads correct registry key.

.. bpo: 38355 .. date: 2019-10-02-15-38-49 .. nonce: n3AWX6 .. section: Windows

Fixes ntpath.realpath failing on sys.executable.

.. bpo: 38117 .. date: 2019-09-16-14-07-11 .. nonce: hJVf0C .. section: Windows

Update bundled OpenSSL to 1.1.1d

.. bpo: 38092 .. date: 2019-09-13-14-11-42 .. nonce: x31ehI .. section: Windows

Reduce overhead when using multiprocessing in a Windows virtual environment.

.. bpo: 38133 .. date: 2019-09-12-12-05-55 .. nonce: yFeRGS .. section: Windows

Allow py.exe launcher to locate installations from the Microsoft Store and improve display of active virtual environments.

.. bpo: 38114 .. date: 2019-09-11-15-24-04 .. nonce: cc0E5E .. section: Windows

The pip.ini is no longer included in the Nuget package.

.. bpo: 32592 .. date: 2019-09-11-14-51-56 .. nonce: jvQMD9 .. section: Windows

Set Windows 8 as the minimum required version for API support

.. bpo: 36634 .. date: 2019-09-11-14-42-04 .. nonce: 8Un8ih .. section: Windows

:func:os.cpu_count now returns active processors rather than maximum processors.

.. bpo: 36634 .. date: 2019-09-11-12-34-31 .. nonce: xLaGgb .. section: Windows

venv activate.bat now works when the existing variables contain double quote characters.

.. bpo: 38081 .. date: 2019-09-11-10-22-01 .. nonce: 8JhzjD .. section: Windows

Prevent error calling :func:os.path.realpath on 'NUL'.

.. bpo: 38087 .. date: 2019-09-10-14-21-40 .. nonce: --eIib .. section: Windows

Fix case sensitivity in test_pathlib and test_ntpath.

.. bpo: 38088 .. date: 2019-09-10-14-17-25 .. nonce: FOvWSM .. section: Windows

Fixes distutils not finding vcruntime140.dll with only the v142 toolset installed.

.. bpo: 37283 .. date: 2019-09-09-12-22-23 .. nonce: 8NvOkU .. section: Windows

Ensure command-line and unattend.xml setting override previously detected states in Windows installer.

.. bpo: 38030 .. date: 2019-09-04-14-01-08 .. nonce: _USdtk .. section: Windows

Fixes :func:os.stat failing for block devices on Windows

.. bpo: 38020 .. date: 2019-09-03-11-47-37 .. nonce: xFZ2j0 .. section: Windows

Fixes potential crash when calling :func:os.readlink (or indirectly through :func:~os.path.realpath) on a file that is not a supported link.

.. bpo: 37705 .. date: 2019-08-30-15-15-22 .. nonce: 2o4NWW .. section: Windows

Improve the implementation of winerror_to_errno().

.. bpo: 37549 .. date: 2019-08-22-09-04-44 .. nonce: TpKI3M .. section: Windows

:func:os.dup no longer fails for standard streams on Windows 7.

.. bpo: 1311 .. date: 2019-08-21-12-58-18 .. nonce: BoW1wU .. section: Windows

The nul file on Windows now returns True from :func:~os.path.exists and a valid result from :func:os.stat with S_IFCHR set.

.. bpo: 9949 .. date: 2019-08-14-13-40-15 .. nonce: zW45Ks .. section: Windows

Enable support for following symlinks in :func:os.realpath.

.. bpo: 37834 .. date: 2019-08-12-12-00-24 .. nonce: VB2QVj .. section: Windows

Treat all name surrogate reparse points on Windows in :func:os.lstat and other reparse points as regular files in :func:os.stat.

.. bpo: 36266 .. date: 2019-08-08-18-05-27 .. nonce: x4eZU3 .. section: Windows

Add the module name in the formatted error message when DLL load fail happens during module import in _PyImport_FindSharedFuncptrWindows(). Patch by Srinivas Nyayapati.

.. bpo: 25172 .. date: 2019-08-06-18-09-18 .. nonce: Akreij .. section: Windows

Trying to import the :mod:!crypt module on Windows will result in an :exc:ImportError with a message explaining that the module isn't supported on Windows. On other platforms, if the underlying _crypt module is not available, the ImportError will include a message explaining the problem.

.. bpo: 37778 .. date: 2019-08-06-13-54-12 .. nonce: AY1XhH .. section: Windows

Fixes the icons used for file associations to the Microsoft Store package.

.. bpo: 37734 .. date: 2019-08-06-09-35-12 .. nonce: EoJ9Nh .. section: Windows

Fix use of registry values to launch Python from Microsoft Store app.

.. bpo: 37702 .. date: 2019-07-29-16-49-31 .. nonce: Lj2f5e .. section: Windows

Fix memory leak on Windows in creating an SSLContext object or running urllib.request.urlopen('https://...').

.. bpo: 37672 .. date: 2019-07-24-14-36-28 .. nonce: uKEVHN .. section: Windows

Switch Windows Store package's pip to use bundled :file:pip.ini instead of :envvar:PIP_USER variable.

.. bpo: 10945 .. date: 2019-07-01-12-38-48 .. nonce: s0YBHG .. section: Windows

Officially drop support for creating bdist_wininst installers on non-Windows systems.

.. bpo: 37445 .. date: 2019-06-28-18-10-29 .. nonce: LsdYO6 .. section: Windows

Include the FORMAT_MESSAGE_IGNORE_INSERTS flag in FormatMessageW() calls.

.. bpo: 37369 .. date: 2019-06-28-09-44-08 .. nonce: 1iVpxq .. section: Windows

Fixes path for :data:sys.executable when running from the Microsoft Store.

.. bpo: 37380 .. date: 2019-06-25-04-15-22 .. nonce: tPxjuz .. section: Windows

Don't collect unfinished processes with subprocess._active on Windows to cleanup later. Patch by Ruslan Kuprieiev.

.. bpo: 37351 .. date: 2019-06-20-12-50-32 .. nonce: asTnVW .. section: Windows

Removes libpython38.a from standard Windows distribution.

.. bpo: 35360 .. date: 2019-06-18-09-05-08 .. nonce: tdqSmo .. section: Windows

Update Windows builds to use SQLite 3.28.0.

.. bpo: 37267 .. date: 2019-06-13-04-15-51 .. nonce: Ygo5ef .. section: Windows

On Windows, :func:os.dup no longer creates an inheritable fd when handling a character file.

.. bpo: 36779 .. date: 2019-06-11-15-41-34 .. nonce: 0TMw6f .. section: Windows

Ensure time.tzname is correct on Windows when the active code page is set to CP_UTF7 or CP_UTF8.

.. bpo: 32587 .. date: 2019-05-10-15-25-44 .. nonce: -0g2O3 .. section: Windows

Make :const:winreg.REG_MULTI_SZ support zero-length strings.

.. bpo: 28269 .. date: 2019-05-05-05-23-34 .. nonce: -MOHI7 .. section: Windows

Replace use of :c:func:strcasecmp for the system function :c:func:!_stricmp. Patch by Minmin Gong.

.. bpo: 36590 .. date: 2019-04-10-21-13-26 .. nonce: ZTaKcu .. section: Windows

Add native Bluetooth RFCOMM support to socket module.

.. bpo: 38117 .. date: 2019-09-15-21-29-13 .. nonce: ZLsoAZ .. section: macOS

Updated OpenSSL to 1.1.1d in macOS installer.

.. bpo: 38089 .. date: 2019-09-10-14-24-35 .. nonce: eedgyD .. section: macOS

Move Azure Pipelines to latest VM versions and make macOS tests optional

.. bpo: 18049 .. date: 2019-07-13-15-58-18 .. nonce: MklhQQ .. section: macOS

Increase the default stack size of threads from 5MB to 16MB on macOS, to match the stack size of the main thread. This avoids crashes on deep recursion in threads.

.. bpo: 34602 .. date: 2019-07-02-01-06-47 .. nonce: 10d4wl .. section: macOS

Avoid test suite failures on macOS by no longer calling resource.setrlimit to increase the process stack size limit at runtime. The runtime change is no longer needed since the interpreter is being built with a larger default stack size.

.. bpo: 35360 .. date: 2019-06-18-08-58-30 .. nonce: -CWbfy .. section: macOS

Update macOS installer to use SQLite 3.28.0.

.. bpo: 34631 .. date: 2019-06-18-00-30-40 .. nonce: vSifcv .. section: macOS

Updated OpenSSL to 1.1.1c in macOS installer.

.. bpo: 26353 .. date: 2019-11-09-23-55-59 .. nonce: duYZiF .. section: IDLE

Stop adding newline when saving an IDLE shell window.

.. bpo: 4630 .. date: 2019-10-28-04-48-03 .. nonce: upgjiV .. section: IDLE

Add an option to toggle IDLE's cursor blink for shell, editor, and output windows. See Settings, General, Window Preferences, Cursor Blink. Patch by Zackery Spytz.

.. bpo: 38598 .. date: 2019-10-26-18-16-24 .. nonce: 6kH9FY .. section: IDLE

Do not try to compile IDLE shell or output windows

.. bpo: 36698 .. date: 2019-10-04-18-03-09 .. nonce: BKcmom .. section: IDLE

IDLE no longer fails when write non-encodable characters to stderr. It now escapes them with a backslash, as the regular Python interpreter. Added the errors field to the standard streams.

.. bpo: 35379 .. date: 2019-09-17-01-28-56 .. nonce: yAECDr .. section: IDLE

When exiting IDLE, catch any AttributeError. One happens when EditorWindow.close is called twice. Printing a traceback, when IDLE is run from a terminal, is useless and annoying.

.. bpo: 38183 .. date: 2019-09-16-15-04-29 .. nonce: eudCN1 .. section: IDLE

To avoid problems, test_idle ignores the user config directory. It no longer tries to create or access .idlerc or any files within. Users must run IDLE to discover problems with saving settings.

.. bpo: 38077 .. date: 2019-09-09-22-08-36 .. nonce: Mzpfe2 .. section: IDLE

IDLE no longer adds 'argv' to the user namespace when initializing it. This bug only affected 3.7.4 and 3.8.0b2 to 3.8.0b4.

.. bpo: 38041 .. date: 2019-09-05-23-12-13 .. nonce: nxmGGK .. section: IDLE

Shell restart lines now fill the window width, always start with '=', and avoid wrapping unnecessarily. The line will still wrap if the included file name is long relative to the width.

.. bpo: 35771 .. date: 2019-09-01-10-22-55 .. nonce: tdbmbP .. section: IDLE

To avoid occasional spurious test_idle failures on slower machines, increase the hover_delay in test_tooltip.

.. bpo: 37824 .. date: 2019-08-26-00-41-53 .. nonce: YY5jAI .. section: IDLE

Properly handle user input warnings in IDLE shell. Cease turning SyntaxWarnings into SyntaxErrors.

.. bpo: 37929 .. date: 2019-08-24-22-00-33 .. nonce: jb7523 .. section: IDLE

IDLE Settings dialog now closes properly when there is no shell window.

.. bpo: 37902 .. date: 2019-08-21-16-02-49 .. nonce: _R_adE .. section: IDLE

Add mousewheel scrolling for IDLE module, path, and stack browsers. Patch by George Zhang.

.. bpo: 37849 .. date: 2019-08-14-09-43-15 .. nonce: -bcYF3 .. section: IDLE

Fixed completions list appearing too high or low when shown above the current line.

.. bpo: 36419 .. date: 2019-08-04-17-10-01 .. nonce: TJZqOc .. section: IDLE

Refactor IDLE autocomplete and improve testing.

.. bpo: 37748 .. date: 2019-08-04-15-27-50 .. nonce: 0vf6pg .. section: IDLE

Reorder the Run menu. Put the most common choice, Run Module, at the top.

.. bpo: 37692 .. date: 2019-07-27-15-14-20 .. nonce: TRHGjD .. section: IDLE

Improve highlight config sample with example shell interaction and better labels for shell elements.

.. bpo: 37628 .. date: 2019-07-26-17-51-13 .. nonce: kX4AUF .. section: IDLE

Settings dialog no longer expands with font size.

.. bpo: 37627 .. date: 2019-07-20-23-33-53 .. nonce: dQhUNB .. section: IDLE

Initialize the Customize Run dialog with the command line arguments most recently entered before. The user can optionally edit before submitting them.

.. bpo: 33610 .. date: 2019-07-18-10-11-36 .. nonce: xYqMLg .. section: IDLE

Fix code context not showing the correct context when first toggled on.

.. bpo: 37530 .. date: 2019-07-11-00-05-31 .. nonce: AuyCyD .. section: IDLE

Optimize code context to reduce unneeded background activity. Font and highlight changes now occur along with text changes instead of after a random delay.

.. bpo: 27452 .. date: 2019-07-03-22-47-44 .. nonce: nePPLi .. section: IDLE

Cleanup config.py by inlining RemoveFile and simplifying the handling of file in CreateConfigHandlers.

.. bpo: 37325 .. date: 2019-06-18-16-40-05 .. nonce: GssOf1 .. section: IDLE

Fix tab focus traversal order for help source and custom run dialogs.

.. bpo: 37321 .. date: 2019-06-17-16-35-30 .. nonce: zVTTGS .. section: IDLE

Both subprocess connection error messages now refer to the 'Startup failure' section of the IDLE doc.

.. bpo: 17535 .. date: 2019-06-13-01-07-20 .. nonce: K8i2St .. section: IDLE

Add optional line numbers for IDLE editor windows. Windows open without line numbers unless set otherwise in the General tab of the configuration dialog.

.. bpo: 26806 .. date: 2019-06-10-22-48-50 .. nonce: Zltkum .. section: IDLE

To compensate for stack frames added by IDLE and avoid possible problems with low recursion limits, add 30 to limits in the user code execution process. Subtract 30 when reporting recursion limits to make this addition mostly transparent.

.. bpo: 37177 .. date: 2019-06-07-00-17-41 .. nonce: voU6pQ .. section: IDLE

Properly 'attach' search dialogs to their main window so that they behave like other dialogs and do not get hidden behind their main window.

.. bpo: 37039 .. date: 2019-06-04-23-27-33 .. nonce: FN_fBf .. section: IDLE

Adjust "Zoom Height" to individual screens by momentarily maximizing the window on first use with a particular screen. Changing screen settings may invalidate the saved height. While a window is maximized, "Zoom Height" has no effect.

.. bpo: 35763 .. date: 2019-06-04-20-36-24 .. nonce: 7XdoWz .. section: IDLE

Make calltip reminder about '/' meaning positional-only less obtrusive by only adding it when there is room on the first line.

.. bpo: 5680 .. date: 2019-06-03-00-39-29 .. nonce: VCQfOO .. section: IDLE

Add 'Run... Customized' to the Run menu to run a module with customized settings. Any 'command line arguments' entered are added to sys.argv. One can suppress the normal Shell main module restart.

.. bpo: 36390 .. date: 2019-03-21-08-35-00 .. nonce: OdDCGk .. section: IDLE

Gather Format menu functions into format.py. Combine paragraph.py, rstrip.py, and format methods from editor.py.

.. bpo: 38118 .. date: 2019-10-08-15-07-52 .. nonce: pIZD6H .. section: Tools/Demos

Update Valgrind suppression file to ignore a false alarm in :c:func:PyUnicode_Decode when using GCC builtin strcmp().

.. bpo: 38347 .. date: 2019-10-02-09-48-42 .. nonce: 2Tq5D1 .. section: Tools/Demos

pathfix.py: Assume all files that end on '.py' are Python scripts when working recursively.

.. bpo: 37803 .. date: 2019-09-12-16-15-55 .. nonce: chEizy .. section: Tools/Demos

pdb's --help and --version long options now work.

.. bpo: 37942 .. date: 2019-08-24-12-11-30 .. nonce: 7H8N9a .. section: Tools/Demos

Improve ArgumentClinic converter for floats.

.. bpo: 37704 .. date: 2019-07-29-13-59-19 .. nonce: xxGUz_ .. section: Tools/Demos

Remove Tools/scripts/h2py.py: use cffi to access a C API in Python.

.. bpo: 37675 .. date: 2019-07-24-16-20-54 .. nonce: 951Cvf .. section: Tools/Demos

2to3 now works when run from a zipped standard library.

.. bpo: 37034 .. date: 2019-05-27-16-13-08 .. nonce: zbTgy8 .. section: Tools/Demos

Argument Clinic now uses the argument name on errors with keyword-only argument instead of their position. Patch contributed by Rémi Lapeyre.

.. bpo: 37064 .. date: 2019-05-27-15-26-12 .. nonce: k_SPW2 .. section: Tools/Demos

Add option -k to pathscript.py script: preserve shebang flags. Add option -a to pathscript.py script: add flags.

.. bpo: 37633 .. date: 2019-11-04-21-10-47 .. nonce: oOGVdo .. section: C API

Re-export some function compatibility wrappers for macros in pythonrun.h.

.. bpo: 38644 .. date: 2019-11-04-17-59-46 .. nonce: euO_RR .. section: C API

Provide :c:func:Py_EnterRecursiveCall and :c:func:Py_LeaveRecursiveCall as regular functions for the limited API. Previously, there were defined as macros, but these macros didn't work with the limited API which cannot access PyThreadState.recursion_depth field. Remove _Py_CheckRecursionLimit from the stable ABI.

.. bpo: 38650 .. date: 2019-10-30-22-03-03 .. nonce: 0pi8zt .. section: C API

The global variable :c:data:PyStructSequence_UnnamedField is now a constant and refers to a constant string.

.. bpo: 38540 .. date: 2019-10-21-09-24-03 .. nonce: 314N_T .. section: C API

Fixed possible leak in :c:func:PyArg_Parse and similar functions for format units "es#" and "et#" when the macro :c:macro:PY_SSIZE_T_CLEAN is not defined.

.. bpo: 38395 .. date: 2019-10-08-01-23-24 .. nonce: MJ6Ey9 .. section: C API

Fix a crash in :class:weakref.proxy objects due to incorrect lifetime management when calling some associated methods that may delete the last reference to object being referenced by the proxy. Patch by Pablo Galindo.

.. bpo: 36389 .. date: 2019-10-07-17-15-09 .. nonce: hFX_jD .. section: C API

The _PyObject_CheckConsistency() function is now also available in release mode. For example, it can be used to debug a crash in the visit_decref() function of the GC.

.. bpo: 38266 .. date: 2019-10-03-12-53-53 .. nonce: 0FIC1q .. section: C API

Revert the removal of PyThreadState_DeleteCurrent() with documentation.

.. bpo: 38303 .. date: 2019-09-30-16-53-30 .. nonce: YoIs0M .. section: C API

Update audioop extension module to use the stable ABI (PEP-384). Patch by Tyler Kieft.

.. bpo: 38234 .. date: 2019-09-24-17-09-48 .. nonce: d0bhEA .. section: C API

:c:func:!Py_SetPath now sets :data:sys.executable to the program full path (:c:func:!Py_GetProgramFullPath) rather than to the program name (:c:func:!Py_GetProgramName).

.. bpo: 38234 .. date: 2019-09-20-17-22-41 .. nonce: ZbquVK .. section: C API

Python ignored arguments passed to :c:func:!Py_SetPath, :c:func:!Py_SetPythonHome and :c:func:!Py_SetProgramName: fix Python initialization to use specified arguments.

.. bpo: 38205 .. date: 2019-09-19-18-26-29 .. nonce: Db1OJL .. section: C API

The :c:func:Py_UNREACHABLE macro now calls :c:func:Py_FatalError.

.. bpo: 38140 .. date: 2019-09-13-01-24-47 .. nonce: y59qaO .. section: C API

Make dict and weakref offsets opaque for C heap types by passing the offsets through PyMemberDef

.. bpo: 15088 .. date: 2019-09-05-14-17-21 .. nonce: plt8Em .. section: C API

The C function PyGen_NeedsFinalizing has been removed. It was not documented, tested or used anywhere within CPython after the implementation of :pep:442. Patch by Joannah Nanjekye. (Patch by Joannah Nanjekye)

.. bpo: 36763 .. date: 2019-08-23-18-45-11 .. nonce: q3Kh8Z .. section: C API

Options added by PySys_AddXOption() are now handled the same way than PyConfig.xoptions and command line -X options.

.. bpo: 37926 .. date: 2019-08-23-11-35-55 .. nonce: hnI5IQ .. section: C API

Fix a crash in PySys_SetArgvEx(0, NULL, 0).

.. bpo: 37879 .. date: 2019-08-17-13-50-21 .. nonce: CZeUem .. section: C API

Fix subtype_dealloc to suppress the type decref when the base type is a C heap type

.. bpo: 37645 .. date: 2019-07-21-21-08-47 .. nonce: 4DcUaI .. section: C API

Add :c:func:!_PyObject_FunctionStr to get a user-friendly string representation of a function-like object. Patch by Jeroen Demeyer.

.. bpo: 29548 .. date: 2019-07-17-09-50-50 .. nonce: 5wIptQ .. section: C API

The functions PyEval_CallObject, PyEval_CallFunction, PyEval_CallMethod and PyEval_CallObjectWithKeywords are deprecated. Use :c:func:PyObject_Call and its variants instead.

.. bpo: 37151 .. date: 2019-07-16-11-02-00 .. nonce: YKfuNA .. section: C API

PyCFunction_Call is now a deprecated alias of :c:func:PyObject_Call.

.. bpo: 37540 .. date: 2019-07-10-12-27-28 .. nonce: E8Z773 .. section: C API

The vectorcall protocol now requires that the caller passes only strings as keyword names.

.. bpo: 37207 .. date: 2019-07-07-10-37-07 .. nonce: SlVNky .. section: C API

The vectorcall protocol is now enabled for type objects: set tp_vectorcall to a vectorcall function to be used instead of tp_new and tp_init when calling the class itself.

.. bpo: 21120 .. date: 2019-07-06-23-56-47 .. nonce: lXHqlT .. section: C API

Exclude Python-ast.h, ast.h and asdl.h from the limited API.

.. bpo: 37483 .. date: 2019-07-02-15-42-37 .. nonce: vftT4f .. section: C API

Add new function _PyObject_CallOneArg for calling an object with one positional argument.

.. bpo: 36763 .. date: 2019-06-28-15-49-16 .. nonce: zrmgki .. section: C API

Add :c:func:PyConfig_SetWideStringList function.

.. bpo: 37337 .. date: 2019-06-19-12-06-31 .. nonce: gXIGyU .. section: C API

Add fast functions for calling methods: :c:func:!_PyObject_VectorcallMethod, :c:func:!_PyObject_CallMethodNoArgs and :c:func:!_PyObject_CallMethodOneArg.

.. bpo: 28805 .. date: 2019-06-14-14-03-51 .. nonce: qZC0N_ .. section: C API

The :c:macro:METH_FASTCALL calling convention has been documented.

.. bpo: 37221 .. date: 2019-06-11-02-50-38 .. nonce: 4tClQT .. section: C API

The new function :c:func:!PyCode_NewWithPosOnlyArgs allows to create code objects like :c:func:!PyCode_New, but with an extra posonlyargcount parameter for indicating the number of positonal-only arguments.

.. bpo: 37215 .. date: 2019-06-10-15-32-34 .. nonce: yzoNyU .. section: C API

Fix dtrace issue introduce by bpo-36842

.. bpo: 37194 .. date: 2019-06-07-14-03-52 .. nonce: uck7MD .. section: C API

Add a new public :c:func:PyObject_CallNoArgs function to the C API: call a callable Python object without any arguments. It is the most efficient way to call a callback without any argument. On x86-64, for example, PyObject_CallFunctionObjArgs(func, NULL) allocates 960 bytes on the stack per call, whereas PyObject_CallNoArgs(func) only allocates 624 bytes per call.

.. bpo: 37170 .. date: 2019-06-06-08-47-04 .. nonce: hO_fpM .. section: C API

Fix the cast on error in :c:func:PyLong_AsUnsignedLongLongMask().

.. bpo: 35381 .. date: 2019-01-18-17-05-26 .. nonce: 9CbeW3 .. section: C API

Convert posixmodule.c statically allocated types DirEntryType and ScandirIteratorType to heap-allocated types.

.. bpo: 34331 .. date: 2018-08-04-00-59-44 .. nonce: iaUkmU .. section: C API

Use singular/plural noun in error message when instantiating an abstract class with non-overridden abstract method(s).