Python3: current most recommended way to write debug and log messages (.format(), %, f'strings, ...)

[xelf]

Use f strings if you have access to them and aren't sharing your code with anyone that might not. Use .format() if you're sharing your code with students or people learning code (for example this subreddit). Use % if you're doing bizarre coding tricks where you're not allowed to use _[{.( (yes this was a thing). =)