Mailman 3 June 2026 - Python-announce-list

TatSu V5.23.0 New Features + Bug Fixes - Less Dependencies
by Juancarlo Añez June 29, 2026

June 29, 2026

[V5.23.0] NEW FEATURES + BUGFIXES + (- DEPENDENCIES) ADDED * Added --generate-parser option to the cling CLI tool. * Added tatsu.util.barz — self-contained progress bar rendering (replaces * rich.progress). * Added tatsu.util.treez — self-contained dependency tree rendering (replaces * rich.tree). * Added tests/tree_test.py. * Added g2e, bench, and ideps subcommands to cling CLI — all tools now * invocable through cling. * Added add_argparse_options(parser) pattern to bench.py, ideps.py, g2etool.py * for uniform CLI interface. * Added tatsu.ztyle.markup — Rich-style markup parser ([bold]text[/], * [red]...[/all]). Parse with markup() → returns StyleZ (a str subclass * wrapping list[Style]; styles via .style property). Optionally pass a color * policy. * Added Style.from_raw() — reconstruct a Style from an ANSI escape string * (e.g. "\e[31mhello\e[0m") for roundtrip support. * Added Style.apply_style() — applies ANSI rendering to an arbitrary string * directly. * Added tatsu.util.tty — shared TTY/ANSI utilities (ANSI_RE, SGR_RE, * tty_escape, tty_unescape, descape, visual_len, cursor hide/show, pushup, * blankpad). * Added etc/RICH_MARKUP.md — specification for the Rich-style markup syntax. * Added Style.__json__() protocol — Style now serializes through * asjson/fromjson (any object with __json__ method is supported). * Added tatsu/packetz/ — inter-task communication via filesystem-based message * passing queues that work across threading and multiprocessing. * Added tatsu/barz/ — self-contained progress bar rendering with ztyle * coloring support and a single background rendering thread. * Added rich dependency removed from core: pygments optional for colored cling * output; graphviz optional for graphical diagrams (text-based railroad * diagrams remain default). CHANGED * No more colorama: All mentions of colorama removed. The project consistently * uses its own ztyle library. * No more rich dependency: cling CLI no longer pulls in rich. Progress bars * use tatsu.util.barz. Dependency trees use tatsu.util.treez. Summaries use * ztyle. * colorize module renamed to ztyle to avoid confusion with the colorize * package on PyPI. * tatsu.grammars renamed to tatsu.peg (kept grammars.py shim). * tatsu.api moved into its own tatsu.api package. * ideps.py refactored to use own Tree + Style instead of rich.tree. * bench.py, ideps.py, g2etool.py migrated from ad-hoc argument parsing to * add_argparse_options(parser) + main(parser) -> int. * Bar metrics refactored: Metrics class with lazy @cached_property per column; * BarRowData base class extracted to break circular dependency; Col enum moved * to own module. * tatsu/util/escapes.py renamed to tatsu/util/tty.py with expanded API (cursor * controls, pushup, blankpad, etc.). * Style.__repr__ now uses \e notation consistently and encodes fmt specs for * roundtrip via f{...:...}. * Style.__len__ uses visual_len() from util.tty (ignores ANSI escapes in * length). * packetz serialization simplified: removed hash validation; __class__ * compressed to @ in JSON. * barz.BarRow switched from private accessors to public attributes; * stop_on_complete → selfstop. * parproc.task uses PacketzQueue directly instead of init_queue() helper. FIXED * Fixed: Group no longer optimized away if Group.exp contains non-leaf nodes. * The optimization made EBNF representation semantically incorrect. Re- * introducing a group for --pretty had several special cases (group if part of * Sequence, Named, ...). * Fixed: Exporting cling CLI no longer pulls in rich as a dependency. * Fixed: ANSI escape utilities no longer duplicated across ztyle.style and * packetz.packet; consolidated in util.tty. -- Juancarlo Añez mailto:apalala@gmail.com

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ANN: Crossbar.io 26.6.1, Autobahn and the WAMP-for-Python stack (coordinated 26.6 release)
by Tobias Oberstein June 22, 2026

June 22, 2026

We're happy to announce a coordinated 26.6 release of the complete WAMP-for-Python stack: the Crossbar.io router, the Autobahn|Python library, and the supporting packages, all released and cross-tested together. What is this ============ WAMP (the Web Application Messaging Protocol) is an open protocol that provides two messaging patterns over a single connection: routed Remote Procedure Calls (RPC) and Publish/Subscribe (PubSub). It lets you build distributed applications and microservices where components -- in the browser, on a server, or on a device -- call each other's procedures and share events in real time. The packages in this release: * Crossbar.io -- the WAMP router (the broker/dealer that all clients connect to) * Autobahn|Python -- WAMP and WebSocket client/server library; runs unmodified on both Twisted and asyncio * txaio -- the Twisted/asyncio compatibility helper * zLMDB -- object-relational in-memory persistence on LMDB * cfxdb -- Crossbar.io database schema package (on zLMDB) * xbr -- XBR data-market extensions for WAMP All packages run on CPython 3.11-3.14 and PyPy 3.11. Highlights ========== * Coordinated, cross-tested release. The whole stack was released together at 26.6, with the router (Crossbar.io) acting as the integration oracle: the libraries are exercised together against the WAMP test suite, on both CPython and PyPy, before any package is tagged. * Router reliability fix. Fixed a bug in the router's dealer where,after a particular call-cancel / disconnect sequence, a callee registration could be left behind as a "zombie" that silently dropped routed calls (reported from a production deployment). Added a regression test. * Serializer coverage on CPython and PyPy. JSON, MsgPack, CBOR and FlatBuffers are now covered by round-trip tests on both interpreters, with graceful handling when an optional serializer (UBJSON) isn't available on a given platform. * Broader binary wheels and portable native code. Added the missing aarch64 wheels (CPython 3.12 / 3.14) and macOS wheels for a symmetric platform matrix (#1848), and fixed a PyPy/Windows wheel gap (#1859). The optional NVX native-vectorized WebSocket acceleration now builds against a portable CPU baseline (x86-64-v2 / armv8-a) instead of possibly emitting "-march=native", which could cause SIGILL on a different CPU than the build host; native tuning is now opt-in. musllinux / Alpine (musl libc) wheels are not yet published but are on the roadmap (#1877). * Software supply chain (SLSA). The release pipeline was reworked for a verifiable chain of custody: each artifact is built once, its checksum is verified, and the exact verified bytes are what gets published -- there is no rebuild between testing and publishing -- using OIDC trusted publishing with attestations. A shell-injection attack surface in the CI/CD pipeline itself was also closed (GHSA-6658-6vq6-hjpr). To be precise: this concerned the build pipeline that *produces* our artifacts, not a runtime vulnerability in the shipped packages. On the roadmap ============== Work in progress, with design details in the Autobahn|Python issue tracker: * Software supply chain: SLSA Level 2/3 provenance and PEP 740 attestations (#1842) * Post-quantum cryptography for WAMP: ML-KEM / ML-DSA (#1847) * FIPS: run on FIPS-enabled Linux kernels (RHEL 9 / Rocky 9) and a crypto-policy option (#1844, #1846) Where to get it =============== Crossbar.io 26.6.1 PyPI: https://pypi.org/project/crossbar/26.6.1/ Git: https://github.com/crossbario/crossbar/tree/v26.6.1 Autobahn|Python 26.6.2 PyPI: https://pypi.org/project/autobahn/26.6.2/ Git: https://github.com/crossbario/autobahn-python/tree/v26.6.2 txaio 26.6.1 PyPI: https://pypi.org/project/txaio/26.6.1/ Git: https://github.com/crossbario/txaio/tree/v26.6.1 zLMDB 26.6.1 PyPI: https://pypi.org/project/zlmdb/26.6.1/ Git: https://github.com/crossbario/zlmdb/tree/v26.6.1 cfxdb 26.6.1 PyPI: https://pypi.org/project/cfxdb/26.6.1/ Git: https://github.com/crossbario/cfxdb/tree/v26.6.1 xbr 26.6.1 PyPI: https://pypi.org/project/xbr/26.6.1/ Git: https://github.com/wamp-proto/wamp-xbr/tree/v26.6.1 Documentation and community =========================== * Protocol: https://wamp-proto.org/ * Crossbar.io: https://crossbario.readthedocs.io/ * Autobahn: https://autobahn.readthedocs.io/ * txaio: https://txaio.readthedocs.io/ * zLMDB: https://zlmdb.readthedocs.io/ * cfxdb: https://cfxdb.readthedocs.io/ * xbr: https://xbr.readthedocs.io/ * Issues / discussions: see each project's GitHub repository Licensing: Crossbar.io is EUPL-1.2; the libraries (Autobahn|Python, txaio, zLMDB, cfxdb) are MIT-licensed. -- The Crossbar.io / Autobahn team

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Numpy 2.5.0 Released
by Charles R Harris June 21, 2026

June 21, 2026

Hi All, Numpy 2.5.0 is a transitional release. It drops support for Python 3.11, marking the end of distutils, and expires a large number of deprecations made in the 2.0.x release. It also improves free threading and brings sorting into compliance with the array-api standard with the addition of descending sorts. There is also a fair amount of preparation for Python 3.15, which will be supported starting with the first rc. Highlights are: - Distutils has been removed, - Many expired deprecations, - Many new deprecations, - Many static typing improvements, - Improved support for free threading, - Support for descending sorts. This release is the work of 132 contributors spread over 555 pull requests and supports Python versions 3.12-3.14. Wheels can be downloaded from PyPI <https://pypi.org/project/numpy/2.5.0>; release notes and the changelog are available on Github <https://github.com/numpy/numpy/releases/tag/v2.5.0>. Cheers, Charles Harris

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pytest-9.1.1
by Ran Benita June 19, 2026

June 19, 2026

pytest-9.1.1 ======================================= pytest 9.1.1 has just been released to PyPI. This is a bug-fix release, being a drop-in replacement. The full changelog is available at https://docs.pytest.org/en/stable/changelog.html. Thanks to all of the contributors to this release: * Bruno Oliveira * Ran Benita Happy testing, The pytest Development Team

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ANN: Lea 4.1.0 released!
by pie.denis＠skynet.be June 15, 2026

June 15, 2026

Lea 4.1.0 is now released! --> https://pypi.org/project/lea/ What is Lea? ----------------- Lea is a Python module for playing with discrete probability distributions in an intuitive way. This ranges from simple coin flipping, random sampling to Bayesian networks, Probabilistic Programming (PP), machine learning and symbolic computation. One salient feature of Lea is the ability to change the probability representation, viz. float, fractions, decimals, and symbols. Lea can be used for education, AI, PP, etc. Comprehensive tutorials are available online (see Wiki pages). What's new in Lea 4.1.0? --------------------------------- Apart from minor bug fixes or improvements, the major changes since Lea 4.1.0 concern *documentation*: * Long-awaited. there is now an online documentation of lea module (autodoc): --> https://lea.readthedocs.io * the tutorials / examples have been migrated and improved; missing images have been restored: --> https://qsor.atlassian.net/wiki/spaces/Lea/pages/524291/Lea+Home To learn more... ---------------------- Lea on PyPI: https://pypi.org/project/lea Lea project page: https://bitbucket.org/piedenis/lea Lea module doc: https://lea.readthedocs.io <https://lea.readthedocs.io/> Lea home page: https://qsor.atlassian.net/wiki/spaces/Lea/pages/524291/Lea+Home . For a 5' tour, check out the poster presented at PROBPROG2020 conference: --> https://probprog.cc/2020/assets/posters/fri/69.pdf . With the hope that Lea can make this universe less erratic, Pierre Denis

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ANN: Dev.us.kg - A new Python community forum
by Facha Nf June 15, 2026

June 15, 2026

Hello Python community, I'm excited to announce the launch of **Dev.us.kg**, a new, free community forum for Python developers and developers of all skill levels. 🔗 Forum: https://dev.us.kg **What you can do on the forum:** - Ask Python questions and get help - Share your Python projects and get feedback - Discuss Python best practices - Connect with other Python developers **Categories include:** - Python 🐍 - PHP 🐘 - Rust 🦀 - C# (.NET) - Ruby 💎 - SQL - Lua - HTML CSS JS - Share Tools The forum is completely free, has no tracking, and is open to everyone. It's a space to learn, share, and build together. Join us and help build a welcoming Python community: 👉 https://dev.us.kg Best regards, AmineKHD

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TieXiu v0.1.4
by Juancarlo Añez June 14, 2026

June 14, 2026

https://pypi.org/project/TieXiu/ ## [v0.1.4] 2026-06-14 New syntax + Semantics ### Added * `@name`, `@int`, `@uint`, `@float`, `@bool` meta syntax for rule expressions. These yield `NameMeta`, `IntMeta`, `UIntMeta`, `FloatMeta`, and `BoolMeta` AST nodes respectively. ### Changed * EBNF grammar semantics are now configured at the API layer rather than deep in the parser internals, giving library users a clean hook to supply their own semantics for grammar parsing. -- Juancarlo Añez mailto:apalala@gmail.com

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OGoPEGo v0.1.13
by Juancarlo Añez June 14, 2026

June 14, 2026

https://pypi.org/project/ogopego/ ## [v0.1.13] 2026-06-14 New syntax + optimized grammar models ### Added - New `@name`, `@int`, `@uint`, `@float`, `@bool` meta-expressions for typed token matching (names, signed/unsigned ints, floats, bools) - `Cursor.MatchName`/`MatchInt`/`MatchUInt`/`MatchFloat`/`MatchBool` methods on `RuneCursor` and `StrCursor` - `Ctx` interface methods that delegate to cursor matching - Five concrete model types (`NameMeta`, `IntMeta`, `UIntMeta`, `FloatMeta`, `BoolMeta`) with `MetaExp` base - Full compilation pipeline: EBNF tree compile, JSON import/export, analysis passes, display (pretty-print & railroads) - 40 cursor-level tests ported from TatSu - Boot grammar usage of `@name` in rule definitions ### Changed - Meta expression dispatch updated from single `*MetaExp` type case to five individual type cases across the compiler pipeline - All TatSu `@` meta features brought to parity with TatSu v5.21.1 ### Changed - Refactored grammar semantics from function type (`SemanticsFunc`) to `GrammarSemantics` interface in `pkg/config`; replaced `GrammarParserSemantics` with `EBNFGrammarSemantics` struct adding meta-expression node production (`NameMeta`, `IntMeta`, `UIntMeta`, `FloatMeta`, `BoolMeta`) during boot grammar compilation of `@` expressions -- Juancarlo Añez mailto:apalala@gmail.com

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TatSu v5.22.0
by Juancarlo Añez June 14, 2026

June 14, 2026

https://pypi.org/project/TatSu/ # [v5.22.0] new syntax+cli+features [v5.22.0]: https://github.com/neogeny/tatsu/compare/v5.21.0...v5.22.0 ## Added ### `cling` — new default CLI - Three subcommands: `tatsu run` (parse files), `tatsu boot` (show boot grammar), `tatsu grammar` (grammar transformations) - Multi-file batch parsing with live dual-column progress bars — overall progress + per-file heartbeat powered by the new parser-level heartbeat hook - Per-file verbose output (`--verbose`) with timing and error details - Summary table with file/line counts, successes, failures, success rate, lines/sec, and elapsed time - `--quiet` to suppress progress and summary, `--nproc` for parallel workers - Files read once; all reports use cached content - The previous CLI is still available as `otatsu` ### `Heartbeat` protocol — per-token progress hook - `Heart` protocol in `tatsu/util/heart.py` with a single `beat(mark, total)` method; `NullHeart` no-op for parallel or unobserved parsing - `ParserConfig.heart` field lets applications inject a heartbeat receiver; `ParserCore` issues a `heart.beat(pos, len)` on token advancement and rule calls with a 0.128s cooldown for real-time reporting of parsing progress ### New `colorize` module in `tatsu/util/colorize/`: - `Color`/`Style` ANSI colour library in `tatsu/util/colorize/` with zero dependencies, dynamic TTY/`NO_COLOR`/`FORCE_COLOR` support, 256-colour palettes, 24-bit RGB, and 148 CSS named colours - `Color.default()` factory method for the system-default colour policy - `Style` chainable modifier methods (`bold()`, `dim()`, `fg()`, `bg()`, etc.) all returning immutable copies; instances are callable (equivalent to `.apply()`), so a single style can be reused: `hl = Style().red().bold(); print(hl("text"))` - Lazy-loaded `named_color()` and `css_color()` standalone lookup functions re-exported from the package - `ConsoleTracer` and `_ColorSet` (`exceptions.py`) now compose `Style` objects instead of concatenating ANSI strings, eliminating bleeding between trace/error colour spans ```python from tatsu.colorize import Style style = Style().red().bold() print(style("text")) ``` ### `Meta` expressions in grammars - `@name`, `@int`, `@uint`, `@float`, `@bool` meta-expressions for typed matching (identifiers, signed/unsigned integers, floating point literals, and boolean literals) - `FailedMeta` exception for `@` meta failures - `-z` / `--optimize` CLI option to optimize the grammar model before generating output ## Changed - Cache optimized grammar models; inline single-element sequences and call chains in `Rule.optimized()` - `Cursor`/`Text` protocols moved from `input/text.py` → `input/cursor.py` - Versioning via `uv-dynamic-versioning`; `_version.py` reads from `importlib.metadata` - CI: upgrade to `checkout@v6`, `setup-uv@v7`, `setup-python@v6`; all dependencies via `uv sync` ## Removed - Deprecated `override_single_deprecated` (bare `@` as override) from grammar and boot parser to allow the symbol to be used for the new _meta_-expressions ## CLING The New Console Interface #### Options the `run` subcommand ```bash sage: tatsu run [-h] [-q] [-v] [-t] [-o OUTPUT] [-c {auto,always,never}] [-j] [-m] [-s START] [-n NPROC] path inputs [inputs ...] positional arguments: path Path to a grammar in EBNF or JSON format inputs The files to be parsed options: -h, --help show this help message and exit -j, --json Print output in JSON format -m, --model Print the model code -s, --start START Name of the start rule -n, --nproc NPROC Number of concurrent workers global options: -q, --quiet Suppress progress bar and spinner output -v, --verbose Provide more detailed information about the parsing process -t, --trace Display a detailed trace of the parsing process -o, --output OUTPUT Output to a file or directory instead of stdout -c, --color {auto,always,never} Control colorized output (default: auto) ``` #### Console output for the `run` subcommand ```bash results: ✗ Ternary1.java 0.0s ✓ Ternary2.java 0.2s ✓ JavaTernaryOperatorExamples.java 0.2s ✓ NavPanelCore.java 2.3s ✓ GwpCreditcardOperations.java 3.8s FAILURES: 1 error: Expected one of: ';' 'annotation_type_declaration' 'class_declaration' 'enum_declaration' 'interface_declaration' 'type_declaration' --> datasets/Ternary1.java@23[1:1] | 1 | #public class Ternary1 | ^ Expected one of: ';' 'annotation_type... → compilation_unit → start files input 5 source lines input 2047 success lines 2019 sloc 1724 successes 4 failures 1 success rate 80 % sloc/sec 318 sl/s run time 0:06 wall time 0:00 ``` -- Juancarlo Añez mailto:apalala@gmail.com

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pytest-9.1.0
by Ran Benita June 13, 2026

June 13, 2026

pytest-9.1.0 ======================================= The pytest team is proud to announce the 9.1.0 release! This release contains new features, improvements, and bug fixes, the full list of changes is available in the changelog: https://docs.pytest.org/en/stable/changelog.html For complete documentation, please visit: https://docs.pytest.org/en/stable/ As usual, you can upgrade from PyPI via: pip install -U pytest Thanks to all of the contributors to this release: * 1Utkarsh1 * Aditya Giri * Alejandro Villate * Alex Waygood * Anton Zhilin * Antonis Gardi * Bruno Oliveira * Bubble-Interface * Charles-Meldhine Madi Mnemoi * DavidAG * Denis Cherednichenko * DetachHead * Dhruva Kumar * Dr Alex Mitre * EternalRights * Fazeel Usmani * Florian Bruhin * Freya Bruhin * Fridayworks * Garion Milazzo * Hamza Mobeen * Hugo van Kemenade * Ilya Manafi * John Litborn * Julia Knaak * Junhao Liao * Kadir Can Ozden * Lai Jia Yang * Liam DeVoe * Lily Wu * Marco Edward Gorelli * Maxime Grenu * Mike Fiedler * Mikhail Golikov * Mukunda Rao Katta * NIYONSHUTI Emmanuel * Nikesh Chavhan * Noa Levi * Paul Zuradzki * Philipp A. * Pierre Sassoulas * Praneeth Kodumagulla * Puneet Dixit * Ran Benita * Randy Döring * Ronald Eddy Jr * Ronny Pfannschmidt * Samuel Newbold * Stanis Trendelenburg * Sviatoslav Sydorenko * Sylvain MARIE * Syncrain * Sóla Lusøt * Tejas Verma * Tobias Deiminger * Tom Most * V1SHAL421 * Varun Chawla * Vladimir * Warren * Will Toohey * Yast * Yusuke Kadowaki * arya rizky * dariomesic * isra17 * jakkdl * jiayang lai * jxramos * minbang930 * morning-verlu * ron * 사재혁 * 🇺🇦 Sviatoslav Sydorenko (Святослав Сидоренко) Happy testing, The pytest Development Team

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