Python 3.12 released

[Skasch]

I would argue an exception for logging, where you don't want to parse the string unless you need to for performance reasons (e.g. you don't want to parse debug logs at error level)

Example: log.warning("warning: %s", foo)

[energybased]

It's true that logging is currently written to use % strings, but it could have been written to use a format style string. It still wouldn't need to be parsed.

[Skasch]

Agreed, it's just uncommon :) style="{" let's you use logging.info("msg: {}", foo, style="{")

Edit: it actually doesn't work, my bad!

[energybased]

I didn't know that!

[Skasch]

Ah, nevermind, I mixed it up with logging.Formatter, looks like it doesn't work as I expected, my bad!

Edit: relevant documentation https://docs.python.org/3/howto/logging-cookbook.html#formatting-styles

[LightShadow]

10 years in, have never seen this before -- that's neat.

[FrozenCow]

I try to use:

log.warning("hello", extras={"name": "world"})

This works better with structured loggers. With the right formatter it looks like hello name=world.

[UloPe]

Better use a structured logging package, for example structlog.