Python Bytes
Python Bytes
Sep 29, 2021
#252 Jupyter is now a desktop app!
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About the show

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Special guest: Ethan Swan

Michael #0: Changing themes to DIY

Brian #1: SQLFluff

  • Suggested by Dave Kotchessa.
  • A SQL Linter, written in Python, tested with pytest
  • Configurable, and configuration can live in many places including tox.ini and pyproject.toml.
  • Great docs
  • Rule reference with anti-pattern/best practice format
  • Includes dialects for ANSI, PostgreSQL, MySQL, Teradata, BigQuery, Snoflake
  • Note in docs: “SQLFluff is still in an open alpha phase - expect the tool to change significantly over the coming months, and expect potentially non-backward compatible api changes to happen at any point.”

Michael #2: JupyterLab Desktop

  • JupyterLab App is the cross-platform standalone application distribution of JupyterLab.
  • Bundles a Python environment with several popular Python libraries ready to use in scientific computing and data science workflows.
  • JupyterLab App works on Debian and Fedora based Linux, macOS and Windows operating systems.

Ethan #3: Requests Cache

  • Create a requests_cache session and call HTTP methods from there
    • You can also do it without a session but that’s a bit weird, looks like it’s monkey patching requests or something…
  • Results are cached
  • Very handy for repeatedly calling endpoints
    • especially if the returned data is large, or the server has to do some compute
  • Reminds me of @functools.lru_cache
  • Can set things like how long the cache should last (when to invalidate)
  • Funny easter egg in example: “# Cache 400 responses as a solemn reminder of your failures”

Brian #4: pypi-rename

  • This is a cookiecutter template from Simon Willison
  • Backstory:
    • To refresh my memory on how to publish a new package with flit I created a new pytest plugin.
    • Brian Skinn noticed it somehow, and suggested a better name. Thanks Brian.
    • So, how to nicely rename. I searched and found Simon’s template, which is…
  • A cookiecutter template. So you can use cookiecutter to do some of this work for you.
  • But it’s based on setuptools, and I kinda like flit lately, so I just used the instructions.
  • The README.md includes instructions for the steps needed:
    • Create renamed version
    • Publish under new name
    • Change old one to depend on new one, but be mostly empty
    • Modify readme to tell people what's going on
    • Publish old name as a notice
  • Now people looking for old one will find new one.
  • People just installing old one will end up with new one also since it’s a dependency.

Michael #5: Django 4 coming with Redis Adapter

  • #33012 closed New feature (fixed) → Add a Redis cache backend.
  • Adds support for Redis to be used as a caching backend with Django.
  • Redis is the most popular caching backend, adding it to django.core.cache module would be a great addition for developers who previously had to rely on the use of third party packages.
  • It will be simpler than that provided by django-redis, for instance customising the serialiser is out-of-scope for the initial pass.

Ethan #6: PEP 612

  • It wasn’t possible to type a function that took in a function and returned a function with the same signature (which is what many decorators do)
    • This creates a ParamSpec – which is much like a TypeVar, for anyone who has used them to type generic functions/classes
  • It’s a reminder that typing is still missing features and evolving, and it’s good to accept the edge cases for now – “gradual typing”
    • Reading Fluent Python by Ramalho has influenced my view on this – don’t lose your mind trying to type crazy stuff, just accept that it’s “gradual”
  • Mention how typing is still evolving in Python and it’s good to keep an eye out for new features that help you (see also PEP 645 – using int? for Optional[int]; and PEP 655 – annotating some TypedDict keys as required and others not required)

Extras

Michael

  • Earsketch
  • Django Critical CVE: CVE-2021-35042
    • Vulnerable versions: >= 3.0.0, < 3.1.13
    • Patched version: 3.1.13
    • Django 3.1.x before 3.1.13 and 3.2.x before 3.2.5 allows QuerySet.order_by SQL injection if order_by is untrusted input from a client of a web application.

Ethan

  • Pedalboard
    • I happened upon this project recently and checked back, only to see that Brett Cannon was the last committer! A doc fix, like he suggested last episode

Brian

Joke: QA 101

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