Convert the Py_TYPE() and Py_SIZE() macros to static inline
functions. The Py_SET_TYPE() and Py_SET_SIZE() functions must now be
used to set an object type and size.
A number of places in the code base (notably ceval.c and frameobject.c) rely on mapping variable names to indices in the frame "locals plus" array (AKA fast locals), and thus opargs. Currently the compiler indirectly encodes that information on the code object as the tuples co_varnames, co_cellvars, and co_freevars. At runtime the dependent code must calculate the proper mapping from those, which isn't ideal and impacts performance-sensitive sections. This is something we can easily address in the compiler instead.
This change addresses the situation by replacing internal use of co_varnames, etc. with a single combined tuple of names in locals-plus order, along with a minimal array mapping each to its kind (local vs. cell vs. free). These two new PyCodeObject fields, co_fastlocalnames and co_fastllocalkinds, are not exposed to Python code for now, but co_varnames, etc. are still available with the same values as before (though computed lazily).
Aside from the (mild) performance impact, there are a number of other benefits:
* there's now a clear, direct relationship between locals-plus and variables
* code that relies on the locals-plus-to-name mapping is simpler
* marshaled code objects are smaller and serialize/de-serialize faster
Also note that we can take this approach further by expanding the possible values in co_fastlocalkinds to include specific argument types (e.g. positional-only, kwargs). Doing so would allow further speed-ups in _PyEval_MakeFrameVector(), which is where args get unpacked into the locals-plus array. It would also allow us to shrink marshaled code objects even further.
https://bugs.python.org/issue43693
The PyType_Ready() function now raises an error if a type is defined
with the Py_TPFLAGS_HAVE_GC flag set but has no traverse function
(PyTypeObject.tp_traverse).
* bpo-44246: Update What's New for importlib.metadata.
Bump version of importlib_metadata included.
Add note about compatibility notice and fix link to entry_points documentation.
Add note about removal of access by index on Distribution.entry_points.
* Fix syntax mistake in issue reference.
Co-authored-by: Ken Jin <28750310+Fidget-Spinner@users.noreply.github.com>
* Fix broken reference in entry-points.
Co-authored-by: Ken Jin <28750310+Fidget-Spinner@users.noreply.github.com>
Py_FrozenMain was added to the Limited C API in [bpo-42591]() (3.10.0a4);
but to fix that issue it would be enough to add it to the regular C API.
The function is undocumented, tests were added very recently ([bpo-44131]()),
and most importantly, it is not present in all builds of Python, as
the linker sometimes omits it as unused.
It should be added back when these issues are fixed.
Note that this does not affect Python's regular C API.
The fix only applies to ``isinstance``. ``issubclass`` isn't affected (because it was always working to begin with). So I also fixed the news to reflect that.
The timeit doc references Tim Peters introduction to the Chapter 18,
Algorithms, of the second edition. The first editiion was before timeit.
The third edition instead has Chapter 1, Data Structures and Algorithms,
without Tim's introduction.
The previous example did not fully showcase the interest of using gather.
Here the example showcases "the result is an aggregate list of returned values".
Deprecate the following functions to configure the Python
initialization:
* PySys_AddWarnOption()
* PySys_AddWarnOptionUnicode()
* PySys_AddXOption()
* PySys_HasWarnOptions()
* Py_SetPath()
* Py_SetProgramName()
* Py_SetPythonHome()
* Py_SetStandardStreamEncoding()
* _Py_SetProgramFullPath()
Use the new PyConfig API of the Python Initialization Configuration
instead (PEP 587).
* Document os-system, subprocess Patch
* Update Doc/library/os.rst
Co-authored-by: Ken Jin <28750310+Fidget-Spinner@users.noreply.github.com>
Co-authored-by: Ken Jin <28750310+Fidget-Spinner@users.noreply.github.com>
- Reformat the C API and ABI Versioning page (and extend/clarify a bit)
- Rewrite the stable ABI docs into a general text on C API Compatibility
- Add a list of Limited API contents, and notes for the individual items.
- Replace `Include/README.rst` with a link to a devguide page with the same info
C-style formatting with literal format containing only format codes
%s, %r and %a (with optional width, precision and alignment)
will be converted to an equivalent f-string expression.
It can speed up formatting more than 2 times by eliminating
runtime parsing of the format string and creating temporary tuple.
"Zero cost" exception handling.
* Uses a lookup table to determine how to handle exceptions.
* Removes SETUP_FINALLY and POP_TOP block instructions, eliminating (most of) the runtime overhead of try statements.
* Reduces the size of the frame object by about 60%.
This documents in the tutorial docs the behavior of a finally clause in
case it should re-raise an exception but contains a
return/break/continue statement.
Left click and drag to select lines. With selection, right click for context menu with copy and copy-with-prompts.
Also add copy-with-prompts to the text-box context menu.
Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
* bpo-43926: Cleaner metadata with PEP 566 JSON support.
* Add blurb
* Add versionchanged and versionadded declarations for changes to metadata.
* Use descriptor for PEP 566
Reverts commit e653d4d8e8 and makes
parsing even more strict. Like socket.inet_pton() any leading zero
is now treated as invalid input.
Signed-off-by: Christian Heimes <christian@python.org>
Co-authored-by: Łukasz Langa <lukasz@langa.pl>
Noted my recent contributions in "What's New In Python 3.10". Also made some edits clarifying "annotations" vs "type hints", and some other edits for correctness.
Add a new Py_TPFLAGS_DISALLOW_INSTANTIATION type flag to disallow
creating type instances: set tp_new to NULL and don't create the
"__new__" key in the type dictionary.
The flag is set automatically on static types if tp_base is NULL or
&PyBaseObject_Type and tp_new is NULL.
Use the flag on the following types:
* _curses.ncurses_version type
* _curses_panel.panel
* _tkinter.Tcl_Obj
* _tkinter.tkapp
* _tkinter.tktimertoken
* _xxsubinterpretersmodule.ChannelID
* sys.flags type
* sys.getwindowsversion() type
* sys.version_info type
Update MyStr example in the C API documentation to use
Py_TPFLAGS_DISALLOW_INSTANTIATION.
Add _PyStructSequence_InitType() function to create a structseq type
with the Py_TPFLAGS_DISALLOW_INSTANTIATION flag set.
type_new() calls _PyType_CheckConsistency() at exit.
Add inspect.get_annotations, which safely computes the annotations defined on an object. It works around the quirks of accessing the annotations from various types of objects, and makes very few assumptions about the object passed in. inspect.get_annotations can also correctly un-stringize stringized annotations.
inspect.signature, inspect.from_callable, and inspect.from_function now call inspect.get_annotations to retrieve annotations. This means inspect.signature and inspect.from_callable can now un-stringize stringized annotations, too.
Accessing the following attributes will now fire PEP 578 style audit hooks as ("object.__getattr__", obj, name):
* PyTracebackObject: tb_frame
* PyFrameObject: f_code
* PyGenObject: gi_code, gi_frame
* PyCoroObject: cr_code, cr_frame
* PyAsyncGenObject: ag_code, ag_frame
Add an AUDIT_READ attribute flag aliased to READ_RESTRICTED.
Update obsolete flag documentation.
Links for 'raise Exception from x' target to 'The raise statement' (7.8) section instead of 'The import statement' (7.11) section.
There are more modified links than in the bug report because I searched some other ones which can get the same improvement.
* Add also references to --with-trace-refs option.
* Move _ob_next and _ob_prev at the end, since they don't exist by
default and are related to debug.
Introduce Py_TPFLAGS_IMMUTABLETYPE flag for immutable type objects, and
modify PyType_Ready() to set it for static types.
Co-authored-by: Victor Stinner <vstinner@python.org>
Add new C-API functions to control the state of the garbage collector:
PyGC_Enable(), PyGC_Disable(), PyGC_IsEnabled(),
corresponding to the functions in the gc module.
Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
Co-authored-by: Victor Stinner <vstinner@python.org>
Faster bz2/lzma/zlib via new output buffering.
Also adds .readall() function to _compression.DecompressReader class
to take best advantage of this in the consume-all-output at once scenario.
Often a 5-20% speedup in common scenarios due to less data copying.
Contributed by Ma Lin.
In 3.12 ``True`` or ``False`` will be returned for all containment checks,
with ``True`` being returned if the value is either a member of that enum
or one of its members' value.
The check about the f argument type was removed in this commit:
2c94aa567e
Thanks for Pedro Arthur Duarte (pedroarthur.jedi at gmail.com) by the help with
this bug.
Previous ID (5233) refers to "Sieve Email Filtering: Subaddress
Extension". It seems that the actual reference should be "Internet
Message Format" RFC 5322 (https://tools.ietf.org/html/rfc5322).
(The typo probably comes from commit 29d1bc0842 in which the ID of
this RFC got updated from the obsolete 2822.)
Co-authored-by: Ambrose Chua <ambrose@hey.com>
asyncio.get_event_loop() emits now a deprecation warning when it creates a new event loop.
In future releases it will became an alias of asyncio.get_running_loop().
The argument order of `link_to()` is reversed compared to what one may expect, so:
a.link_to(b)
Might be expected to create *a* as a link to *b*, in fact it creates *b* as a link to *a*, making it function more like a "link from". This doesn't match `symlink_to()` nor the documentation and doesn't seem to be the original author's intent.
This PR deprecates `link_to()` and introduces `hardlink_to()`, which has the same argument order as `symlink_to()`.
To improve the user experience understanding what part of the error messages associated with SyntaxErrors is wrong, we can highlight the whole error range and not only place the caret at the first character. In this way:
>>> foo(x, z for z in range(10), t, w)
File "<stdin>", line 1
foo(x, z for z in range(10), t, w)
^
SyntaxError: Generator expression must be parenthesized
becomes
>>> foo(x, z for z in range(10), t, w)
File "<stdin>", line 1
foo(x, z for z in range(10), t, w)
^^^^^^^^^^^^^^^^^^^^
SyntaxError: Generator expression must be parenthesized
The inclusion of PyOS_ReadlineFunctionPointer in python3dll.c was a mistake.
According to PEP 384:
> functions expecting FILE* are not part of the ABI, to avoid depending
> on a specific version of the Microsoft C runtime DLL on Windows.
https://bugs.python.org/issue43868
- `_Py_EncodeLocaleRaw`, which is private by name, undocumented,
and wasn't exported in `python3.dll`, is moved to a private header.
- `_Py_HashSecret_Initialized`, again private by name, undocumented,
and not exported in `python3.dll`, is excluded with `Py_LIMITED_API`.
- `PyMarshal_*` and `PyMember_*One` functions, declared in private headers and
not exported in `python3.dll`, are removed from `Doc/data/stable_abi.dat`.
- `PyMem_Calloc` which *was* exported in `python3dll.c`, is moved to public
headers where it joins its other `PyMem_*` friends.
Only the last change is documented in the blurb; others are not user-visible.
(Nothing uses `Doc/data/stable_abi.dat` yet.)
https://bugs.python.org/issue43795
This change:
* merges `distutils.sysconfig` into `sysconfig` while keeping the original functionality and
* marks `distutils.sysconfig` as deprecated
https://bugs.python.org/issue41282
The sys module uses the kernel32.dll version number, which can vary from the "actual" Windows version.
Since the best option for getting the version is WMI (which is expensive), we switch back to launching cmd.exe (which is also expensive, but a lot less code on our part).
sys.getwindowsversion() is not updated to avoid launching executables from that module.
add:
* `_simple_enum` decorator to transform a normal class into an enum
* `_test_simple_enum` function to compare
* `_old_convert_` to enable checking `_convert_` generated enums
`_simple_enum` takes a normal class and converts it into an enum:
@simple_enum(Enum)
class Color:
RED = 1
GREEN = 2
BLUE = 3
`_old_convert_` works much like` _convert_` does, using the original logic:
# in a test file
import socket, enum
CheckedAddressFamily = enum._old_convert_(
enum.IntEnum, 'AddressFamily', 'socket',
lambda C: C.isupper() and C.startswith('AF_'),
source=_socket,
)
`_test_simple_enum` takes a traditional enum and a simple enum and
compares the two:
# in the REPL or the same module as Color
class CheckedColor(Enum):
RED = 1
GREEN = 2
BLUE = 3
_test_simple_enum(CheckedColor, Color)
_test_simple_enum(CheckedAddressFamily, socket.AddressFamily)
Any important differences will raise a TypeError
Pablo Galindo
Erlend Egeberg Aasland
Victor Stinner
Eric Snow
Zackery Spytz
andrei kulakov
Wm. Keith van der Meulen
Zac Bentley
MapleCCC
Jason R. Coombs
Jules Lasne
Dong-hee Na
Martmists
Jürgen Gmach
Ken Jin
Peter Law
Jero Bado
Mark
Mariusz Felisiak
Petr Viktorin
Raymond Hettinger
Zack Kneupper
Tushar Sadhwani
Junnosuke Kuroda
Irit Katriel
E-Paine
Terry Jan Reedy
Numerlor
Bruno
naglis
Catherine Devlin
Tal Einat
Rafael Fontenelle
Miguel Brito
Rory Yorke
kudavid
Géry Ogam
Daniel Shahaf
josephernest
Shantanu
Saiyang Gou
Barney Gale
Mark Shannon
Thomas Grainger
uniocto
Julien Palard
dhoekstra2000
Eric V. Smith
Serhiy Storchaka
Batuhan Taskaya
Ned Deily
Senthil Kumaran
Inada Naoki
Scott Noyes
Jean-Abou-Samra
Roberto Hueso
krisaoe
Jelle Zijlstra
Brandt Bucher
Shreyan Avigyan
Christian Heimes
larryhastings
Shreyash Sharma
Yurii Karabas
Mohamed Moselhy
JT
Steve Dower
Ryan Hileman
sblondon
Nick Coghlan
Andre Delfino
Paul Moore
scoder
Ma Lin
Ethan Furman
Tzu-ping Chung
Llandy Riveron Del Risco
Adorilson Bezerra
Gabriel R F
Etienne Gautier
Taneli Hukkinen
Denis Laxalde
Sergey Fedoseev
Tymoteusz Wołodźko
Lumír 'Frenzy' Balhar
Hai Shi
JunWei Song
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Joonas Paalasmaa