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* What's New in Python 3.9: Reorganize C API Changes (GH-19794)Victor Stinner2020-04-291-159/+173
| | | | | | | | | | Move Build Changes and C API Changes to the end of the document. Most Python users don't build Python themselves and don't use the C API. Other changes: * Add Build Changes section * Add sub-sections to the C API Changes * Sort modules in Improved Modules section: move nntplib after multiprocessing
* bpo-40428: Cleanup free list part of C API Changes doc (GH-19793)Victor Stinner2020-04-291-11/+9
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* bpo-40421: Add PyFrame_GetBack() function (GH-19765)Victor Stinner2020-04-291-0/+1
| | | | | | New PyFrame_GetBack() function: get the frame next outer frame. Replace frame->f_back with PyFrame_GetBack(frame) in most code but frameobject.c, ceval.c and genobject.c.
* bpo-40428: Remove PyTuple_ClearFreeList() function (GH-19769)Victor Stinner2020-04-291-0/+13
| | | | | | | | | | | | | | | | | | | Remove the following function from the C API: * PyAsyncGen_ClearFreeLists() * PyContext_ClearFreeList() * PyDict_ClearFreeList() * PyFloat_ClearFreeList() * PyFrame_ClearFreeList() * PyList_ClearFreeList() * PySet_ClearFreeList() * PyTuple_ClearFreeList() Make these functions private, move them to the internal C API and change their return type to void. Call explicitly PyGC_Collect() to free all free lists. Note: PySet_ClearFreeList() did nothing.
* bpo-40429: PyFrame_GetCode() now returns a strong reference (GH-19773)Victor Stinner2020-04-291-2/+1
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* bpo-40421: Add PyFrame_GetCode() function (GH-19757)Victor Stinner2020-04-281-0/+4
| | | | | | | | | PyFrame_GetCode(frame): return a borrowed reference to the frame code. Replace frame->f_code with PyFrame_GetCode(frame) in most code, except in frameobject.c, genobject.c and ceval.c. Also add PyFrame_GetLineNumber() to the limited C API.
* bpo-40421: Add pyframe.h header file (GH-19755)Victor Stinner2020-04-281-0/+3
| | | | | | | | | | Add a new separated pyframe.h header file of the PyFrame public C API: it is included by Python.h. Add PyFrame_GetLineNumber() to the limited C API. Replace "struct _frame" with "PyFrameObject" in header files. PyFrameObject is now defined as struct _frame by pyframe.h which is included early enough in Python.h.
* bpo-30966: Add multiprocessing.SimpleQueue.close() (GH-19735)Victor Stinner2020-04-271-0/+8
| | | | | | Add a new close() method to multiprocessing.SimpleQueue to explicitly close the queue. Automerge-Triggered-By: @pitrou
* bpo-40375: Implement imaplib.IMAP4.unselect (GH-19712)Dong-hee Na2020-04-271-0/+7
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* bpo-40334: Add What's New sections for PEP 617 and PEP 585 (GH-19704)Guido van Rossum2020-04-241-0/+43
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* bpo-38061: subprocess uses closefrom() on FreeBSD (GH-19697)Victor Stinner2020-04-241-0/+4
| | | | | | | | | | | | | Optimize the subprocess module on FreeBSD using closefrom(). A single close(fd) syscall is cheap, but when sysconf(_SC_OPEN_MAX) is high, the loop calling close(fd) on each file descriptor can take several milliseconds. The workaround on FreeBSD to improve performance was to load and mount the fdescfs kernel module, but this is not enabled by default. Initial patch by Ed Maste (emaste), Conrad Meyer (cem), Kyle Evans (kevans) and Kubilay Kocak (koobs): https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242274
* bpo-39939: Add str.removeprefix and str.removesuffix (GH-18939)sweeneyde2020-04-221-0/+10
| | | | | Added str.removeprefix and str.removesuffix methods and corresponding bytes, bytearray, and collections.UserString methods to remove affixes from a string if present. See PEP 616 for a full description.
* bpo-39562: Prevent collision of future and compiler flags (GH-19230)Batuhan Taşkaya2020-04-221-0/+4
| | | | | | The constant values of future flags in the __future__ module is updated in order to prevent collision with compiler flags. Previously PyCF_ALLOW_TOP_LEVEL_AWAIT was clashing with CO_FUTURE_DIVISION.
* bpo-34037: Add Python API whatsnew for loop.shutdown_default_executor() (#19634)Kyle Stanley2020-04-211-0/+5
| | | | Co-Authored-By: Victor Stinner <vstinner@python.org>
* bpo-39207: Spawn workers on demand in ProcessPoolExecutor (GH-19453)Kyle Stanley2020-04-191-0/+5
| | | | | Roughly based on https://github.com/python/cpython/commit/904e34d4e6b6007986dcc585d5c553ee8ae06f95, but with a few substantial differences. /cc @pitrou @brianquinlan
* bpo-40257: Improve help for the typing module (GH-19546)Serhiy Storchaka2020-04-181-0/+6
| | | | | | * Show docstring for special forms. * Show docstring for special generic aliases. * Show documentation for __origin__ for generic aliases.
* bpo-40286: Add randbytes() method to random.Random (GH-19527)Victor Stinner2020-04-171-0/+6
| | | | | | | | | | | | Add random.randbytes() function and random.Random.randbytes() method to generate random bytes. Modify secrets.token_bytes() to use SystemRandom.randbytes() rather than calling directly os.urandom(). Rename also genrand_int32() to genrand_uint32(), since it returns an unsigned 32-bit integer, not a signed integer. The _random module is now built with Py_BUILD_CORE_MODULE defined.
* bpo-40257: Output object's own docstring in pydoc (GH-19479)Serhiy Storchaka2020-04-151-0/+13
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* bpo-40208: Remove deprecated has_exec method of SymbolTable (GH-19396)Batuhan Taşkaya2020-04-141-0/+4
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* bpo-39380: Change ftplib encoding from latin-1 to utf-8 (GH-18048)Sebastian Pedersen2020-04-141-0/+3
| | | | | Add the encoding in ftplib.FTP and ftplib.FTP_TLS to the constructor as keyword-only and change the default from "latin-1" to "utf-8" to follow RFC 2640.
* bpo-40234: Revert "bpo-37266: Daemon threads are now denied in ↵Victor Stinner2020-04-121-9/+0
| | | | | subinterpreters (GH-14049)" (GH-19456) This reverts commit 066e5b1a917ec2134e8997d2cadd815724314252.
* bpo-39011: Preserve line endings within ElementTree attributes (GH-18468)mefistotelis2020-04-121-0/+9
| | | | | | | * bpo-39011: Preserve line endings within attributes Line endings within attributes were previously normalized to "\n" in Py3.7/3.8. This patch removes that normalization, as line endings which were replaced by entity numbers should be preserved in original form.
* bpo-40241: Add PyObject_GC_IsTracked and PyObject_GC_IsFinalized to the ↵Pablo Galindo2020-04-111-0/+7
| | | | | public C-API (GH-19461) Add the functions PyObject_GC_IsTracked and PyObject_GC_IsFinalized to the public API to allow to query if Python objects are being currently tracked or have been already finalized by the garbage collector respectively.
* bpo-25780: Expose CAN_RAW_JOIN_FILTERS in the socket module (GH-19190)Zackery Spytz2020-04-091-0/+7
| | | Co-Authored-By: Stefan Tatschner <stefan@rumpelsepp.org>
* bpo-40197: Better describe the benchmark results table (GH-19386)Raymond Hettinger2020-04-051-1/+7
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* bpo-40182: Remove the _field_types attribute of the NamedTuple class (GH-19368)Serhiy Storchaka2020-04-051-0/+5
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* bpo-40094: Add os.waitstatus_to_exitcode() (GH-19201)Victor Stinner2020-04-011-0/+4
| | | | | | | | | | | | | | Add os.waitstatus_to_exitcode() function to convert a wait status to an exitcode. Suggest waitstatus_to_exitcode() usage in the documentation when appropriate. Use waitstatus_to_exitcode() in: * multiprocessing, os, subprocess and _bootsubprocess modules; * test.support.wait_process(); * setup.py: run_command(); * and many tests.
* bpo-33262: Deprecate passing None for `s` to shlex.split() (GH-6514)Zackery Spytz2020-04-011-0/+3
| | | | | | | | | * bpo-33262: Deprecate passing None for `s` to shlex.split() This reads the string to split from standard input. * Update What's New. * Fix shlex.rst
* bpo-8901: Windows registry path is now ignored with the -E option (GH-18169)Zackery Spytz2020-03-301-0/+5
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* bpo-36543: What's new: Document how to replace xml.etree.cElementTree (GH-19188)Miro Hrončok2020-03-271-1/+5
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* bpo-39812: Remove daemon threads in concurrent.futures (GH-19149)Kyle Stanley2020-03-271-0/+5
| | | | | | Remove daemon threads from :mod:`concurrent.futures` by adding an internal `threading._register_atexit()`, which calls registered functions prior to joining all non-daemon threads. This allows for compatibility with subinterpreters, which don't support daemon threads.
* bpo-38237: Use divmod for positional arguments whatsnew example (GH-19171)Ammar Askar2020-03-271-5/+4
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* bpo-39947: Add PyThreadState_GetID() function (GH-19163)Victor Stinner2020-03-251-0/+2
| | | | Add PyThreadState_GetID() function: get the unique identifier of a Python thread state.
* bpo-39999: Improve compatibility of the ast module. (GH-19056)Serhiy Storchaka2020-03-221-6/+8
| | | | | | | * Re-add removed classes Suite, slice, Param, AugLoad and AugStore. * Add docstrings for dummy classes. * Add docstrings for attribute aliases. * Set __module__ to "ast" instead of "_ast".
* bpo-40024: Add PyModule_AddType() helper function (GH-19088)Dong-hee Na2020-03-221-0/+3
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* bpo-39946: Remove _PyThreadState_GetFrame (GH-19094)Victor Stinner2020-03-201-0/+4
| | | | | Remove _PyRuntime.getframe hook and remove _PyThreadState_GetFrame macro which was an alias to _PyRuntime.getframe. They were only exposed by the internal C API. Remove also PyThreadFrameGetter type.
* bpo-39947: Add PyThreadState_GetFrame() function (GH-19092)Victor Stinner2020-03-201-0/+3
| | | | Add PyThreadState_GetFrame() function: get the current frame of a Python thread state.
* bpo-40010: Optimize signal handling in multithreaded applications (GH-19067)Victor Stinner2020-03-191-0/+10
| | | | | | | | | | | | | | | If a thread different than the main thread gets a signal, the bytecode evaluation loop is no longer interrupted at each bytecode instruction to check for pending signals which cannot be handled. Only the main thread of the main interpreter can handle signals. Previously, the bytecode evaluation loop was interrupted at each instruction until the main thread handles signals. Changes: * COMPUTE_EVAL_BREAKER() and SIGNAL_PENDING_SIGNALS() no longer set eval_breaker to 1 if the current thread cannot handle signals. * take_gil() now always recomputes eval_breaker.
* bpo-39984: Move pending calls to PyInterpreterState (GH-19066)Victor Stinner2020-03-191-0/+6
| | | | | | | | | | | | | | | | | If Py_AddPendingCall() is called in a subinterpreter, the function is now scheduled to be called from the subinterpreter, rather than being called from the main interpreter. Each subinterpreter now has its own list of scheduled calls. * Move pending and eval_breaker fields from _PyRuntimeState.ceval to PyInterpreterState.ceval. * new_interpreter() now calls _PyEval_InitThreads() to create pending calls lock. * Fix Py_AddPendingCall() for subinterpreters. It now calls _PyThreadState_GET() which works in a subinterpreter if the caller holds the GIL, and only falls back on PyGILState_GetThisThreadState() if _PyThreadState_GET() returns NULL.
* bpo-39988: Remove ast.AugLoad and ast.AugStore node classes. (GH-19038)Serhiy Storchaka2020-03-171-3/+4
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* bpo-39824: module_traverse() don't call m_traverse if md_state=NULL (GH-18738)Victor Stinner2020-03-171-0/+11
| | | | | | | | | | | | | Extension modules: m_traverse, m_clear and m_free functions of PyModuleDef are no longer called if the module state was requested but is not allocated yet. This is the case immediately after the module is created and before the module is executed (Py_mod_exec function). More precisely, these functions are not called if m_size is greater than 0 and the module state (as returned by PyModule_GetState()) is NULL. Extension modules without module state (m_size <= 0) are not affected. Co-Authored-By: Petr Viktorin <encukou@gmail.com>
* bpo-39638: Keep ASDL signatures in the AST nodes (GH-18515)Batuhan Taşkaya2020-03-161-0/+3
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* bpo-39969: Remove ast.Param node class as is no longer used (GH-19020)Batuhan Taşkaya2020-03-151-2/+3
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* bpo-39507: Add HTTP status 418 "I'm a Teapot" (GH-18291)Ross2020-03-151-2/+2
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* bpo-39509: Update HTTP status code to follow IANA (GH-18294)Dong-hee Na2020-03-141-0/+6
| | | Add status codes 103 EARLY_HINTS and 425 TOO_EARLY.
* bpo-39937: Improve suggestions for removal of getchildren and getiterator in ↵Rahul Kumaresan2020-03-141-4/+7
| | | | | | | changelog (GH-18937) Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
* bpo-39947: Add PyThreadState_GetInterpreter() (GH-18981)Victor Stinner2020-03-131-1/+2
| | | | Add PyThreadState_GetInterpreter(tstate): get the interpreter of a Python thread state.
* bpo-39947: Add PyInterpreterState_Get() function (GH-18979)Victor Stinner2020-03-131-0/+2
| | | | | | * Rename _PyInterpreterState_Get() to PyInterpreterState_Get() and move it the limited C API. * Add _PyInterpreterState_Get() alias to PyInterpreterState_Get() for backward compatibility with Python 3.8.
* bpo-38500: Add _PyInterpreterState_SetEvalFrameFunc() (GH-17340)Victor Stinner2020-03-121-0/+4
| | | | | | | | | | | | PyInterpreterState.eval_frame function now requires a tstate (Python thread state) parameter. Add private functions to the C API to get and set the frame evaluation function: * Add tstate parameter to _PyFrameEvalFunction function type. * Add _PyInterpreterState_GetEvalFrameFunc() and _PyInterpreterState_SetEvalFrameFunc() functions. * Add tstate parameter to _PyEval_EvalFrameDefault().
* bpo-1294959: Fix typo for new attribute platlibdir. (GH-18960)Raúl Cumplido2020-03-121-2/+2
| | | | | Received email on the docs mailing list to fix a typo from `sys.platlitdir` which doesn't exist to the correct new attribute `sys.platlibdir` Automerge-Triggered-By: @vstinner
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