Python Bytes

Topics covered in this episode: jiter A new home for python-build-standalone moka-py uv: An In-Depth Guide Extras Joke Watch on YouTube About the show Sponsored by us! Support our work through: Our courses at Talk Python Training The Complete pytest Course Patreon Supporters Connect with the hosts Michael: @[email protected] / @mkennedy.codes (bsky) Brian: @[email protected] / @brianokken.bsky.social Show: @[email protected] / @pythonbytes.fm (bsky) Join us on YouTube at pythonbytes.fm/live to be part of the audience. Usually Monday at 10am PT. Older video versions available there too. Finally, if you want an artisanal, hand-crafted digest of every week of the show notes in email form? Add your name and email to our friends of the show list, we'll never share it. Michael #1: jiter Fast iterable JSON parser. About to be the backend for Pydantic and Logfire. Currently powers OpenAI / ChatGPT (along with Pydantic itself), at least their Python library, maybe more. jiter has three interfaces: JsonValue an enum representing JSON data Jiter an iterator over JSON data PythonParse which parses a JSON string into a Python object jiter-python - This is a standalone version of the JSON parser used in pydantic-core. The recommendation is to only use this package directly if you do not use pydantic Brian #2: A new home for python-build-standalone Charlie Marsh See also Transferring Python Build Standalone Stewardship to Astral from Gregory Szorc python-build-standalone is the project that has prebuilt binaries for different architectures. used by uv python install 3.12 and uv venv .venv --python 3.12 and uv sync This is good stability news for everyone. Interesting discussion of prebuilt Python from Charlie Michael #3: moka-py A high performance caching library for Python written in Rust moka-py is a Python binding for the highly efficient Moka caching library written in Rust. This library allows you to leverage the power of Moka's high-performance, feature-rich cache in your Python projects. Features Synchronous Cache: Supports thread-safe, in-memory caching for Python applications. TTL Support: Automatically evicts entries after a configurable time-to-live (TTL). TTI Support: Automatically evicts entries after a configurable time-to-idle (TTI). Size-based Eviction: Automatically removes items when the cache exceeds its size limit using the TinyLFU policy. Concurrency: Optimized for high-performance, concurrent access in multi-threaded environments. Brian #4: uv: An In-Depth Guide On SaaS Pegasus blog, so presumably by Cory Zue Good intro to uv Also a nice list of everyday commands Install python: uv python install 3.12 I don’t really use this anymore, as uv venv .venv --python 3.12 or uv sync install if necessary create a virtual env: uv venv .venv --python 3.12 install stuff: uv pip install django add project dependencies build pinned dependencies Also discussion about adopting the new workflow Extras Brian: PydanticAI - not sure why I didn’t see that coming In the “good to know” and “commentary on society” area: Anti-Toxicity Features on Bluesky The WIRED Guide to Protecting Yourself From Government Surveillance Michael: Go sponsor a bunch of projects on GitHub Registration is open for PyCon Joke: Inf

Topics covered in this episode: Loop targets asyncstdlib Bagels: TUI Expense Tracker rloop: An AsyncIO event loop implemented in Rust Extras Joke Watch on YouTube About the show Sponsored by us! Support our work through: Our courses at Talk Python Training The Complete pytest Course Patreon Supporters Connect with the hosts Michael: @[email protected] / @mkennedy.codes (bsky) Brian: @[email protected] / @brianokken.bsky.social Show: @[email protected] / @pythonbytes.fm (bsky) Join us on YouTube at pythonbytes.fm/live to be part of the audience. Usually Monday at 10am PT. Older video versions available there too. Finally, if you want an artisanal, hand-crafted digest of every week of the show notes in email form? Add your name and email to our friends of the show list, we'll never share it. Brian #1: Loop targets Ned Batchelder I don’t think I would have covered this had it not been the surprising opposition to Ned’s code. Here’s the snippet: params = { "query": QUERY, "page_size": 100, } *# Get page=0, page=1, page=2, ...* **for** params["page"] in itertools.count(): data = requests.get(SEARCH_URL, params).json() **if** not data["results"]: **break** ... Ned is utilizing the assignment in the for loop to use the value of count() and store it into the params["page"]. The article includes another version with a temp variable page_num, which I think the naysayers would prefer. But frankly, I think both are fine. Why not put the value right where you want it? Michael #2: asyncstdlib The asyncstdlib library re-implements functions and classes of the Python standard library to make them compatible with async callables, iterables and context managers. It is fully agnostic to async event loops and seamlessly works with asyncio, third-party libraries such as trio, as well as any custom async event loop. Full set of async versions of advantageous standard library helpers, such as zip, map, enumerate, functools.reduce, itertools.tee, itertools.groupby and many others. Safe handling of async iterators to ensure prompt cleanup, as well as various helpers to simplify safely using custom async iterators. Small but powerful toolset to seamlessly integrate existing sync code into async programs and libraries. Brian #3: Bagels: TUI Expense Tracker Jax Tam “Bagels expense tracker is a TUI application where you can track and analyse your money flow, with convenience oriented features and a complete interface. Why an expense tracker in the terminal? I found it easier to build a habit and keep an accurate track of my expenses if I do it at the end of the day, instead of on the go. So why not in the terminal where it's fast, and I can keep all my data locally?” Who hasn’t wanted to write their own expense tracker? This implementation is fun for lots of reasons It’s still new and pretty small, so forking it for your own uses should be easy Built on textual is fun install instructions based on uv tool seems to be the new normal: uv tool install --python 3.13 bagels test suite started pretty useful as is, actually Nice that it includes a roadmap of future goals Would be a fun project to help out with for anyone looking for anyone looking for a shiny new codebase to contribute to. Michael #4: rloop: An AsyncIO event loop implemented in Rust An AsyncIO event loop implemented in Rust From Giovanni Barillari, Creator of Granian RLoop is an AsyncIO event loop implemented in Rust on top of the mio crate. Disclaimer: This is a work in progress and definitely not ready for production usage. Run asyncio.set_event_loop_policy(rloop.EventLoopPolicy()) and done. Similar to uvloop. Extras Brian: I’m currently listening to Four Thousand Weeks - Time Management for Mortals by Oliver Burkeman for the second time. Highly recommend. Development Advent Calendars for 2024 - Adrian Roselli Black Friday at PythonTest.com Michael: Docker cluster monitor Compare engagement across Mastodon / Bsky / Twitter https://bsky.app/profile/pythonbytes.fm/post/3lbseqgr5m22z https://fosstodon.org/@pythonbytes/113545509565796190 https://x.com/pythonbytes/status/1861166179236319288 Back on #277 we talked about StrEnum. Got a nice chance to use it this weekend. Maybe Finance Go sponsor a bunch of projects on GitHub Black Friday at Talk Python Joke: CTRL + X onion

Topics covered in this episode: Talk Python rewritten in Quart PyPI now supports digital attestations Django Rusty Templates PEP 639 is now supported by PYPI Extras Joke Watch on YouTube About the show Sponsored by us! Support our work through: Our courses at Talk Python Training The Complete pytest Course Patreon Supporters Connect with the hosts Michael: @[email protected] / @mkennedy.codes (bsky) Brian: @[email protected] / @brianokken.bsky.social Show: @[email protected] / @pythonbytes.fm (bsky) Join us on YouTube at pythonbytes.fm/live to be part of the audience. Usually Monday at 10am PT. Older video versions available there too. Finally, if you want an artisanal, hand-crafted digest of every week of the show notes in email form? Add your name and email to our friends of the show list, we'll never share it. Michael #1: Talk Python rewritten in Quart Rewrote all of talkpython.fm in Quart (10k lines of code total, 4k changed) Considered FastAPI Litestar Django Hugo Static Site + Python Flask Discussed the multistage upgrade / conversion process Automating tests for all 1,000 pages Brian #2: PyPI now supports digital attestations Dustin Ingram “Attestations provide a verifiable link to an upstream source repository: By signing with the identity of the upstream source repository, such as in the case of an upload of a project built with GitHub Actions, PyPI's support for digital attestations defines a strong and verifiable association between a file on PyPI and the source repository, workflow, and even the commit hash that produced and uploaded the file. Additionally, publishing attestations to a transparency log helps mitigate against both compromise of PyPI and compromise of the projects themselves.” For maintainers If using GH Actions and Trusted Publishing make sure you use pypa/gh-action-pypi-publish, version v1.11.0 or newer that’s it If not “Support for automatic attestation generation and publication from other Trusted Publisher environments is planned.” “While not recommended, maintainers can also manually generate and publish attestations.” See also PyPI Introduces Digital Attestations to Strengthen Python Package Security by Sarah Gooding Are we PEP 740 yet? Michael #3: Django Rusty Templates by Lily Foote An experimental reimplementation of Django's templating language in Rust. Goals 100% compatibility of rendered output. Error reporting that is at least as useful as Django's errors. Improved performance over Django's pure Python implementation. Brian #4: PEP 639 is now supported by PYPI from Brett Cannon PEP 639 – Improving License Clarity with Better Package Metadata For project metadata, use these fields: license and license-files: Examples license field [project] license = "MIT" [project] license = "MIT AND (Apache-2.0 OR BSD-2-clause)" [project] license = "MIT OR GPL-2.0-or-later OR (FSFUL AND BSD-2-Clause)" [project] license = "LicenseRef-Proprietary" Examples of license-files: [project] license-files = ["LICEN[CS]E*", "AUTHORS*"] [project] license-files = ["licenses/LICENSE.MIT", "licenses/LICENSE.CC0"] [project] license-files = ["LICENSE.txt", "licenses/*"] [project] license-files = [] Extras Brian: Playground Wisdom: Threads Beat Async/Await - interesting read from Armin Ronacher about different language abstractions around concurrency. PythonTest.com Discord community is now live Launched last week, as of this morning we’ve got 89 members Anyone already a pythontest community member has received an invite Anyone can join through courses.pythontest.com Everything at pythontest.com is 20% off through Dec 2 with code turkeysale2024 “Python Testing with pytest” eBook 40% off through Dec 2, use code turkeysale2024 Michael: Python 3.14.0a2 released Starter packs: Michael’s Python people: https://bsky.app/starter-pack/mkennedy.codes/3lbdnupl26e2x Directory: https://blueskydirectory.com/starter-packs/all Joke: curl - heavy metal style!

Topics covered in this episode: Thoughts on Django’s Core futurepool Don't return named tuples in new APIs Ziglang: Migrating from AWS to Self-Hosting Extras Joke Watch on YouTube About the show Sponsored by us! Support our work through: Our courses at Talk Python Training The Complete pytest Course Patreon Supporters Connect with the hosts Michael: @[email protected] / @mkennedy.codes (bsky) Brian: @[email protected] / @brianokken.bsky.social Show: @[email protected] / @pythonbytes.fm (bsky) Join us on YouTube at pythonbytes.fm/live to be part of the audience. Usually Monday at 10am PT. Older video versions available there too. Finally, if you want an artisanal, hand-crafted digest of every week of the show notes in email form? Add your name and email to our friends of the show list, we'll never share it. Brian #1: Thoughts on Django’s Core Carlton Gibson Great discussion on Django and Core vs Plugins Sustainability with limited people Keeping core small The release cycle eembrace plugins vs endorsing plugins. Michael #2: futurepool via Pat Decker Takes the concept of multiprocessing Pool to the async/await world. Create a pool then delegate the work: async with FuturePool(2) as fp: result = await fp.map(async_pool_fn, range(10)) I would LOVE to see something like this in a broader background asyncio worker pool concept. But that concept doesn’t exist in asyncio in Python and that’s a failing of the framework IMO. Brian #3: Don't return named tuples in new APIs Brett Cannon First off, I’m grateful for any post that talks about APIs and the API is a module, class, or package API and not a Web/REST API. The term API existed long before the internet. “e.g., get_mouse_position() very likely has a two-item tuple of X and Y coordinates of the screen” “it actually makes your API more complex for both you and your users to use. For you, it doubles the data access API surface for your return type as you have to now support index-based and attribute-based data access forever (or until you choose to break your users and change your return type so it doesn't support both approaches)” “… you probably don't want people doing with your return type, like slicing, iterating over all the items …” Alternatives class dataclass dictionary TypedDict SimpleNamespace “My key point in all of this is to prefer readability and ergonomics over brevity in your code. That means avoiding named tuples except where you are expanding to tweaking an existing API where the named tuple improves over the plain tuple that's already being used.” Michael #4: Ziglang: Migrating from AWS to Self-Hosting The Rust Foundation for example, reports that they spent $404,400 on infrastructure costs in 2023. Zig lang has decided to use a single big cloud machine + mirrors Extras Brian: Changing the Python Test community Was started to answer questions for Test & Code listeners years ago. Primarily pytest questions Used to be Slack. Then moved to Podia forum. Now I’m trying to work out a Discord solution that is both sustainable and usable. Michael: PWang Bsky essay Building A Business From Python Expertise - Michael Kennedy on Work Item Podcast Subscribe to package releases, just put .atom on the end of their releases URL, for example: github.com/mikeckennedy/jinja_partials/releases ← add .atom for RSS pytest-bdd 8.0.0 was just released via Jamie Thomson The big feature (in Jamie’s opinion) is the addition of data tables https://github.com/pytest-dev/pytest-bdd/blob/master/CHANGES.rst#800---2024-11-14 Joke: Breaking: JavaScript Developer Commits to Framework for Record-Breaking 3 Weeks