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Connect with the hosts

• Michael: @mkennedy@fosstodon.org
• Brian: @brianokken@fosstodon.org
• Show: @pythonbytes@fosstodon.org

Join us on YouTube at pythonbytes.fm/stream/live to be part of the audience. Usually Tuesdays at 11am PT. Older video versions available there too.

Brian #1: markdown-it-py

• Yes. another markdown parser.
• Rich recently switched markdown parsers, from commonmark to markdown-it-py.
• Let’s look at those a bit.

Michael #2: Sketch

• via Jake Firman
• Sketch is an AI code-writing assistant for pandas users that understands the context of your data
• A Natural Language interface that successfully navigates many tasks in the data stack landscape.
  • Data Cataloging:
    • General tagging (eg. PII identification)
    • Metadata generation (names and descriptions)
  • Data Engineering:
    • Data cleaning and masking (compliance)
    • Derived feature creation and extraction
  • Data Analysis:
    • Data questions
    • Data visualization
• Watch the video on the GitHub page for a quick intro

Brian #3: Fixing Circular Imports in Python with Protocol

• Built on Subclassing in Python Redux from Hynek
  • We covered this in the summer of 2021, episode 240
  • However, I re-read it recently due to a typing problem
  • Problem is when an object passes itself to another module to be called later.
    • This is common in many design patterns, including just normal callback functions.
    • Normally not a problem with Python, due to duck typing.
    • But with type hints, suddenly it seems like both modules need types from the other.
  • So how do you have two modules use types from each other without a circular import.
  • Hynek produces two options
    • Abstract Data Types, aka Interfaces, using the abc module
      • Requires a third interface class
    • Structural subtyping with Protocol
      • This is what I think I’ll use more often and I’m kinda in love with it now that I understand it.
      • Still has a third type, but one of the modules doesn’t have to know about it.
    • "Structural Subtyping : Structural subtyping is duck typing for types: if your class fulfills the constraints of a [Protocol](https://docs.python.org/3/library/typing.html#typing.Protocol), it’s automatically considered a subtype of it. Therefore, a class can implement many Protocols from all kinds of packages without knowing about them!”
• The Fixing Circular Imports in Python with Protocol article walks through one example of two classes talking with each other, typing, circular imports, and fixing them with Protocol

Michael #4: unrepl

• via/by Ruud van der Ham

• We’ve seen the code samples:

  >>> board = []
  >>> for i in range(3):
  ...     row = ['_'] * 3
  ...     board.append(row)
  ...>>> board
  [['_', '_', '_'], ['_', '_', '_'], ['_', '_', '_']]
  >>> board\[2\][0] = 'X'>>> board
  [['_', '_', '_'], ['_', '_', '_'], ['X', '_', '_']]
  

• But you cannot really run this code. You can’t paste it into a REPL yourself nor can you put it into a .py file.

• So you unrepl it: Copying the above code to the clipboard and run unrepl.
• Paste the result and now you can.
• Unrepl can be used as a command line tool but also as a module.
• The REPL functionality of underscore (_) to get access to the last value is also supported.

Extras

Michael:

• You'll want to update your git ASAP.
• Get course releases at Talk Python via RSS
• Gist for using Turnstile with Python + Pydantic

Joke: there's a bug in the js

• You’ve checked all your database indexes,
• You’ve tuned all your API hooks,
• You’re starting to think
• That you might need a drink,
• Because there’s only one place left to look:
• …
• There must be a bug in the javascript
• Because everything else was built properly
• But the frontend’s a pile of crap ;)