The only things I’d have probably change about this list is the inclusion of some of the collections.abc containers for type annotations, TypedDict and how it can make working with strictly structured dictionaries not terrible (but if it looks like an class and quacks like a class, make it a class if you can), and Counter (only because I forget it exists every single time I should have used it).

Several comments disliking the walrus operator, like many of the features on this list I also hated it… until I found a good use for it. I almost exclusively write strictly typed Python these days (annotations… another feature I originally hated). The walrus operator makes code so much cleaner when you’re dealing with Optionals (or, a Union with None). This comes up a lot with regex patterns:

  if (match := pattern.search(line)) is not None:
    print(match.group())

Could you evaluate match on a separate line before the conditional? Sure. But I find this is a little clearer that the intended life of match is within the conditional, making it less tempting to reuse it elsewhere.

Not a Python feature specifically, but I’d also love to see code that uses regex patterns to embrace named capturing groups more often. .group(“prefix”) is a lot more readable than .group(1).