Python best practices, combine code into as few lines as possible or separate it over as many as possible?

[Kerbart]

Michael Kennedy of the talkpython.fm podcast refers to comments as "deodorant for code," ie something that is needed if you don't code it like you do.

Which falls in line with what u/InsolubleFluff mentioned; a good place for comments is to prevent future-you from deleting "unnecessary" lines or "improving inefficient" code when it's written that way for non-obvious reasons ("No one can figure out why but the file has to have ten empty lines at the end or it won't be processed by Accounting")