#347: The One About Context Mangers

Published Tue, Aug 8, 2023, recorded Tue, Aug 8, 2023

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Michael #1: async-timeout

An asyncio-compatible timeout context manager.
The context manager is useful in cases when you want to apply timeout logic around block of code or in cases when asyncio.wait_for() is not suitable.
Not finished yet timeout can be rescheduled by shift_by() or shift_to() methods

Brian #2: PyPI Project URLs Cheatsheet

Daniel Roy Greenfield
There’s some cool icons available under “Project Links” on pypi.org project pages.
How do you get those? And which ones are available.
Daniel has found out where to look, and built us a cheat sheet. Nice.

Michael #3: httpx-sse

Consume Server-Sent Event (SSE) messages with HTTPX.
SSE are super lightweight, server → client only subscriptions.
Like websockets but less overhead (especially for iot and mobile devices)
httpx-sse provides the connect_sse and aconnect_sse helpers for connecting to an SSE endpoint.
The resulting EventSource object exposes the .iter_sse() and .aiter_sse() methods to iterate over the server-sent events.

Brian #4: Creating a context manager in Python

Trey Hunner
Context managers are those things you use in a with block.
There’s a bunch of cool built in ones.
Building your own is a handy skill to have to clean up your code, and they’re pretty easy, with Trey’s tutorial.
Shown is a great example of temporarily modifying an environmental variable.
Then he gets into what you need to know about as, __enter__, and __exit__.

Extras

Brian:

I think I’ll nix the intro music to Python People. I didn’t know what music to use, so I re-used the music from Test & Code. And I got some very honest feedback that it just doesn’t fit and was better without it. So I’ll rip it out soon.
BTW, next episode to be released is with Bob Belderbos from PyBites. Should be later this week.

Michael:

Joke:

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