Functions re.sub() and re.subn() and corresponding re.Pattern methods
are now 2-3 times faster for replacement strings containing group references.
Closes#91524
Primarily authored by serhiy-storchaka Serhiy Storchaka
Minor-cleanups-by: Gregory P. Smith [Google] <greg@krypto.org>
Rely on the title of the linked internal page instead of putting the title. Sphinx will render with the title correctly, and this will reduce work for translators
* Link ZipFile in What's New entry discussing it
* Add entry for new ZipFile.mkdir method
* Add entry for new zipfile.Path.stem/suffix/suffixes methods
* Add missing line breaks between zipfile bullet list items
* Add entry for new logging.getLevelNamesMapping function
* Add entry for SysLogHandler.createSocket to whatsnew
* Add missing line break between logging bullet list items
The os module and the PyUnicode_FSDecoder() function no longer accept
bytes-like paths, like bytearray and memoryview types: only the exact
bytes type is accepted for bytes strings.
* Whatsnew: Convert literals in enum section to actual x-references
* Whatsnew: Rewrite enum section for clear and consistant phrasing
* Whatsnew: Combine directly related enum items instead of seperating them
* gh-98250: Describe __str__/__format__ changes more clearly/accurately
* Tweak enum section language per feedback from Ethan
* Add line breaks & ref targets to Whatsnew to prepare for future changes
* Use standard heading underbar symbols for H4 sections
* Flatten Porting subsection; clarify scope of/link Python->CAPI sections
* Move C API pending deprecations to C API section, to match the others
Part of #95913
Forward port of #93306, which was a backport of #93185, to address #84694
This adds the What's New entry for the removal of the subinterpreter-related env variable, build-time flag, etc. As @ericsnowcurrently was author of the original changes, I added him as a co-author to the commit.
This addition to the Python 3.11 What's New document were only made to the Python 3.11 branch during the backport process, and not added to the version in `main`. Forward-porting it ensures the docs retain these additions for the future, rather than being lost in a legacy Python versions, allows it to be be edited as part of #95913 , and avoids merge conflicts with routine back-ports of PRs touching it.
I've pulled in the addition exactly as-is with no modifications; any editing will be done in future PRs (and therefore can be reviewed and backported accordingly).
The one other such addition is forward-ported in #98344
This is the next step for deprecating child watchers.
Until we've removed the API completely we have to use it, so this PR is mostly suppressing a lot of warnings when using the API internally.
Once the child watcher API is totally removed, the two child watcher implementations we actually use and need (Pidfd and Thread) will be turned into internal helpers.
* Add/refine cross references to items in other lang changes section
* Unify context manager exception changes into single non-repetitive item
* More clearly describe the intent and consequences of the -P option
* Apply minor clarifications & copyedits to rest of section
* Tweak the formatting of module references
Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>
Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>
* Move Windows py.exe improvements from Typing section to New Features
* Add ref target label and use literal for py.exe
* Be clearer/explict about what legacy version arg components reprisent
* Apply other minor clarity and textual fixes to py.exe launcher text
* Refine phrasing of legacy sentence of py.exe desc
Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>
Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>
Remove the Tools/demo/ directory which contained old demo scripts. A
copy can be found in the old-demos project:
https://github.com/gvanrossum/old-demos
Remove the following old demo scripts:
* beer.py
* eiffel.py
* hanoi.py
* life.py
* markov.py
* mcast.py
* queens.py
* redemo.py
* rpython.py
* rpythond.py
* sortvisu.py
* spreadsheet.py
* vector.py
Changes:
* Remove a reference to the redemo.py script in the regex howto
documentation.
* Remove a reference to the removed Tools/demo/ directory in the
curses documentation.
* Update PC/layout/ to remove the reference to Tools/demo/ directory.
Integer to and from text conversions via CPython's bignum `int` type is not safe against denial of service attacks due to malicious input. Very large input strings with hundred thousands of digits can consume several CPU seconds.
This PR comes fresh from a pile of work done in our private PSRT security response team repo.
Signed-off-by: Christian Heimes [Red Hat] <christian@python.org>
Tons-of-polishing-up-by: Gregory P. Smith [Google] <greg@krypto.org>
Reviews via the private PSRT repo via many others (see the NEWS entry in the PR).
<!-- gh-issue-number: gh-95778 -->
* Issue: gh-95778
<!-- /gh-issue-number -->
I wrote up [a one pager for the release managers](https://docs.google.com/document/d/1KjuF_aXlzPUxTK4BMgezGJ2Pn7uevfX7g0_mvgHlL7Y/edit#). Much of that text wound up in the Issue. Backports PRs already exist. See the issue for links.
The previous wording of this entry suggests that CPython
won't work if optional compiler features are enabled.
That's not the case. The change is that we require C11 rather
than C89.
Note that PEP 7 does say "Python 3.11 and newer versions use C11
without optional features." It is correct there: that's
not a guide for users who compile Python, but for CPython devs
who must avoid the features.
* Add support for the BOLT post-link binary optimizer
Using [bolt](https://github.com/llvm/llvm-project/tree/main/bolt)
provides a fairly large speedup without any code or functionality
changes. It provides roughly a 1% speedup on pyperformance, and a
4% improvement on the Pyston web macrobenchmarks.
It is gated behind an `--enable-bolt` configure arg because not all
toolchains and environments are supported. It has been tested on a
Linux x86_64 toolchain, using llvm-bolt built from the LLVM 14.0.6
sources (their binary distribution of this version did not include bolt).
Compared to [a previous attempt](https://github.com/faster-cpython/ideas/issues/224),
this commit uses bolt's preferred "instrumentation" approach, as well as adds some non-PIE
flags which enable much better optimizations from bolt.
The effects of this change are a bit more dependent on CPU microarchitecture
than other changes, since it optimizes i-cache behavior which seems
to be a bit more variable between architectures. The 1%/4% numbers
were collected on an Intel Skylake CPU, and on an AMD Zen 3 CPU I
got a slightly larger speedup (2%/4%), and on a c6i.xlarge EC2 instance
I got a slightly lower speedup (1%/3%).
The low speedup on pyperformance is not entirely unexpected, because
BOLT improves i-cache behavior, and the benchmarks in the pyperformance
suite are small and tend to fit in i-cache.
This change uses the existing pgo profiling task (`python -m test --pgo`),
though I was able to measure about a 1% macrobenchmark improvement by
using the macrobenchmarks as the training task. I personally think that
both the PGO and BOLT tasks should be updated to use macrobenchmarks,
but for the sake of splitting up the work this PR uses the existing pgo task.
* Simplify the build flags
* Add a NEWS entry
* Update Makefile.pre.in
Co-authored-by: Dong-hee Na <donghee.na92@gmail.com>
* Update configure.ac
Co-authored-by: Dong-hee Na <donghee.na92@gmail.com>
* Add myself to ACKS
* Add docs
* Other review comments
* fix tab/space issue
* Make it more clear that --enable-bolt is experimental
* Add link to bolt's github page
Co-authored-by: Dong-hee Na <donghee.na92@gmail.com>
* Treat tp_weakref and tp_dictoffset like other opaque slots for multiple inheritance.
* Document Py_TPFLAGS_MANAGED_DICT and Py_TPFLAGS_MANAGED_WEAKREF in what's new.
An unrecognized format character in PyUnicode_FromFormat() and
PyUnicode_FromFormatV() now sets a SystemError.
In previous versions it caused all the rest of the format string to be
copied as-is to the result string, and any extra arguments discarded.
gh-93243
This PR is required to reduce diffs of the following porting (no need to either maintain documentation and tests consistent with each porting step, or try to port everything and remove smtpd in a single PR).
Automerge-Triggered-By: GH:warsaw
If an HTTP link is redirected to a same looking HTTPS link, the latter can
be used directly without changes in readability and behavior.
It protects from a men-in-the-middle attack.
This change does not affect Python examples.
* Store tp_weaklist on the interpreter state for static builtin types.
* Factor out _PyStaticType_GET_WEAKREFS_LISTPTR().
* Add _PyStaticType_ClearWeakRefs().
* Add a comment about how _PyStaticType_ClearWeakRefs() loops.
* Document the change.
* Update Doc/whatsnew/3.12.rst
* Fix a typo.
Serhiy Storchaka
C.A.M. Gerlach
Carl Meyer
Rafael Fontenelle
Victor Stinner
Kumar Aditya
Julien Palard
Pablo Galindo Salgado
Hugo van Kemenade
Brett Cannon
Barry Warsaw
Adam Turner
180909
Ev2geny
Guido van Rossum
Will Hawkins
Ofey Chan
Stanley
Gregory P. Smith
Benjamin Peterson
Dong-hee Na
adphrost
Laurie O
Maksym Medvied
Steve Dower
Gregory P. Smith
Petr Viktorin
Kevin Modzelewski
Irit Katriel
Mark Shannon
Christian Heimes
Łukasz Langa
Stanislav Zmiev
esc
Oleg Iarygin
Brandt Bucher
Eric Snow
Ken Jin
Terry Jan Reedy
Ethan Furman
Erlend Egeberg Aasland
Zachary Ware