#412 Closing the loop

Python Bytes

Topics covered in this episode:

• Loop targets
• asyncstdlib
• Bagels: TUI Expense Tracker
• rloop: An AsyncIO event loop implemented in Rust
• Extras
• Joke

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Brian #1: Loop targets

• Ned Batchelder
• I don’t think I would have covered this had it not been the surprising opposition to Ned’s code.

• Here’s the snippet:

  params = { "query": QUERY, "page_size": 100, } *# Get page=0, page=1, page=2, ...* **for** params["page"] in itertools.count(): data = requests.get(SEARCH_URL, params).json() **if** not data["results"]: **break** ... 

• Ned is utilizing the assignment in the for loop to use the value of count() and store it into the params["page"].

• The article includes another version with a temp variable page_num, which I think the naysayers would prefer.
• But frankly, I think both are fine. Why not put the value right where you want it?

Michael #2: asyncstdlib

• The asyncstdlib library re-implements functions and classes of the Python standard library to make them compatible with async callables, iterables and context managers.
• It is fully agnostic to async event loops and seamlessly works with asyncio, third-party libraries such as trio, as well as any custom async event loop.
• Full set of async versions of advantageous standard library helpers, such as zip, map, enumerate, functools.reduce, itertools.tee, itertools.groupby and many others.
• Safe handling of async iterators to ensure prompt cleanup, as well as various helpers to simplify safely using custom async iterators.
• Small but powerful toolset to seamlessly integrate existing sync code into async programs and libraries.

Brian #3: Bagels: TUI Expense Tracker

• Jax Tam

• “Bagels expense tracker is a TUI application where you can track and analyse your money flow, with convenience oriented features and a complete interface.

• Why an expense tracker in the terminal? I found it easier to build a habit and keep an accurate track of my expenses if I do it at the end of the day, instead of on the go. So why not in the terminal where it's fast, and I can keep all my data locally?”

• Who hasn’t wanted to write their own expense tracker?

• This implementation is fun for lots of reasons
  • It’s still new and pretty small, so forking it for your own uses should be easy
  • Built on textual is fun
  • install instructions based on uv tool seems to be the new normal:
    • uv tool install --python 3.13 bagels
  • test suite started
  • pretty useful as is, actually
  • Nice that it includes a roadmap of future goals
  • Would be a fun project to help out with for anyone looking for anyone looking for a shiny new codebase to contribute to.

Michael #4: rloop: An AsyncIO event loop implemented in Rust

• An AsyncIO event loop implemented in Rust
• From Giovanni Barillari, Creator of Granian
• RLoop is an AsyncIO event loop implemented in Rust on top of the mio crate.
• Disclaimer: This is a work in progress and definitely not ready for production usage.
• Run asyncio.set_event_loop_policy(rloop.EventLoopPolicy()) and done.
• Similar to uvloop.

Extras

Brian:

• I’m currently listening to Four Thousand Weeks - Time Management for Mortals by Oliver Burkeman for the second time. Highly recommend.
• Development Advent Calendars for 2024 - Adrian Roselli
• Black Friday at PythonTest.com

Michael:

• Docker cluster monitor
• Compare engagement across Mastodon / Bsky / Twitter
  • https://bsky.app/profile/pythonbytes.fm/post/3lbseqgr5m22z
  • https://fosstodon.org/@pythonbytes/113545509565796190
  • https://x.com/pythonbytes/status/1861166179236319288
• Back on #277 we talked about StrEnum. Got a nice chance to use it this weekend.
• Maybe Finance
• Go sponsor a bunch of projects on GitHub
• Black Friday at Talk Python

Joke: CTRL + X onion