#407 Back to the future, destination 3.14
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Topics covered in this episode:

- **[Python 3.14.0 alpha 1 is now available](https://pythoninsider.blogspot.com/2024/10/python-3140-alpha-1-is-now-available.html?featured_on=pythonbytes))**

• uv supports dependency groups)

• dive: A tool for exploring each layer in a docker image)

• pytest-metadata)

• Extras

• Joke

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Michael #1: Python 3.14.0 alpha 1 is now available)

• First of seven planned alpha releases.

• Many new features for Python 3.14 are still being planned and written. Among the new major new features and changes so far:

• PEP 649): deferred evaluation of annotations)

• Improved error messages)

Brian #2: uv supports dependency groups)

• we covered dependency groups in episode 406)

• as of 0.4.27), uv supports dependency groups

• docs show how to add dependencies) with uv add --group

• also “The --dev, --only-dev, and --no-dev flags are equivalent to --group dev, --only-group dev, and --no-group dev respectively.”

• To install a group, uv pip install --group doesn’t work yet.

• It’s waiting for PyPA to decide on an interface for pip, and uv pip will use that interface.

• But sync works.

`$ uv init # create a pyproject.toml
$ uv add --group foo pytest
$ uv venv # create venv
$ uv sync --group foo # will install all dependencies, including group "foo"
`

Michael #3: dive: A tool for exploring each layer in a docker image)

• via Mike Fiedler

• Features:

• Show Docker image contents broken down by layer

• Indicate what's changed in each layer

• Estimate "image efficiency"

• Quick build/analysis cycles

• CI Integration

Brian #4: pytest-metadata)

• An incredibly useful plugin for adding, you guessed it, metadata, to your pytest results.

• Required for pytest-html) but also useful on it’s own

• Adds metadata to

• text output with --verbose

• xml output when using --junit-xml, handy for CI systems that support junit.xml

• Other plugins depend on this and report in other ways, such as pytest-html

• By default, already grabs

• Python version

• Platform info

• List of installed packages

• List of installed pytest plugins

• You can add your own metadata

• You can access all metadata (and add to it) from tests, fixtures, and hook functions via a metadata fixture.

• This is in the Top pytest Plugins list), currently #5.

Extras

Brian:

• I’ve started filtering deprecated plugins from the pytest plugin list).

• I’m also going to start reviewing the list and pulling out interesting plugins as the topic of the next season of Test & Code).

Michael:

• Pillow 11 is out)

• pip install deutschland)

• Talk Python has a dedicated blog), please subscribe!

Joke: Dog names