Python Bytes

#430 Or you go to jail

Apr 28, 2025

Dive into the latest enhancements from pip 25.1, featuring dependency groups that streamline installs and experimental lock files. Discover AIO HTTP’s compatibility upgrades for high-concurrency web servers. Learn about the savvy choice of a domain name for projects, with Porkbun as a top pick. Explore the integration of PyLock.toml, new methods for handling datetime, and the intriguing world of file transfers. Lastly, enjoy a light-hearted take on 'vibe coding' in AI development!

29:11

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Quick takeaways

Pip 25.1 introduces dependency groups and progress bars, enhancing project organization and user experience during package installations.

AIO HTTP's update for free-threaded Python significantly boosts concurrency, positioning it as a strong competitor among popular web frameworks.

Deep dives

Major Updates in Pip 25.1

Pip 25.1 introduces several significant enhancements, particularly the inclusion of dependency groups as outlined in PEP 735. This allows users to organize dependencies into specific groups, such as 'test', 'lint', and 'dev', improving the management of project dependencies. Another noteworthy feature is the introduction of progress bars during package installation, which provides visible feedback on download status. Additionally, the release includes experimental support for lock files, allowing developers to generate a lock file named 'pylock.toml' to facilitate better dependency management and ensuring consistency across environments.

Intro

3min

Exciting Updates in pip and AIO HTTP Compatibility

5min

The Importance of Choosing the Right Domain Name

3min

Integrating PyLock.toml and New Innovations

14min

Exploring File Transfers and Vibe Coding

4min

Topics covered in this episode:

pip 25.1 has dependency groups, pylock.toml, plus more
aiohttp goes free threaded
uv 0.6.15 supports pylock.toml
Whenever
Extras
Joke

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About the show

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Brian #1: pip 25.1 has dependency groups, pylock.toml, plus more

post What's new in pip 25.1 - Dependency groups!
Richard Si
Discovered this through Hugo van Kemenade

Dependency groups, PEP 735, supported

# pyproject.toml
[dependency-groups]
test = ["pytest", "pytest-xdist"]
lint = ["mypy", "isort"]
# Dependency Groups can include other groups! ✨
dev = [ {include-group = "test"}, {include-group = "lint"} ]

Package installation progress bar
Resumable downloads
Experimental lockfile generation, PEP 751, with pip lock
- so cool
pip index versions is stable, no longer experimental
- use this to get a list of available versions
- ex: python3 -m pip index versions pytest-check
- combine with --json to get a nice script readable output

Michael #2: aiohttp goes free threaded

Thanks to months of consistent contributions by Lysandros Nikolaou, all of the mandatory dependencies of #aiohttp now ship free-threaded variants of #wheels!
This unlocks the same in aiohttp!

Brian #3: uv 0.6.15 supports pylock.toml

Discovered through Brett Cannon
So far, these projects support pylock.toml
- pip
- pip-audit
- pdm
- uv
With uv
- To export a uv.lock to the pylock.toml format,
  - run: uv export -o pylock.toml
- To generate a pylock.toml file from a set of requirements,
  - run: uv pip compile -o pylock.toml -r requirements.in
- To install from a pylock.toml file,
  - run: uv pip sync pylock.toml or uv pip install -r pylock.toml

Michael #4: Whenever

via Pat Decker
Typed and DST-safe datetimes for Python, available in Rust or pure Python.
Whenever helps you write correct and type checked datetime code.
It's also way faster than other third-party libraries—and usually the standard library as well.

Extras

Brian: