#444 Begone Python of Yore!

Topics covered in this episode:

• Coverage.py regex pragmas
• * Python of Yore*
• * nox-uv*
• * A couple Django items*
• Extras
• Joke

Watch on YouTube

About the show

Sponsored by DigitalOcean: pythonbytes.fm/digitalocean-gen-ai Use code DO4BYTES and get $200 in free credit

Connect with the hosts

• Michael: @[e-mail] / @mkennedy.codes (bsky)
• Brian: @[e-mail] / @brianokken.bsky.social
• Show: @[e-mail] / @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: Coverage.py regex pragmas

• Ned Batchelder

• The regex implementation of how coverage.py recognizes pragmas is pretty amazing.

• It’s extensible through plugins

  • covdefaults adds a bunch of default exclusions, and also platform- and version-specific comment syntaxes.
  • coverage-conditional-plugin gives you a way to create comment syntaxes for entire files, for whether other packages are installed, and so on.

• A change from last year (as part of coverage.py 7.6 allows multiline regexes, which let’s us do things like:

  • Exclude an entire file with \\A(?s:.*# pragma: exclude file.*)\\Z
  • Allow start and stop delimiters with # no cover: start(?s:.*?)# no cover: stop
  • Exclude empty placeholder methods with ^\\s*(((async )?def .*?)?\\)(\\s*->.*?)?:\\s*)?\\.\\.\\.\\s*(#|$)
  • See Ned’s article for explanations of these

Michael #2: Python of Yore

• via Matthias
• Use YORE: ... comments to highlight CPython version dependencies.

  # YORE: EOL 3.8: Replace block with line 4.
  if sys.version_info < (3, 9):
  from astunparse import unparse
  else:
  from ast import unparse
  

Then check when they go out of support:

$ yore check --eol-within '5 months'
./src/griffe/agents/nodes/_values.py:11: Python 3.8 will reach its End of