Well, I’ve finally found a way using plemmy instead of Lemmy.py. Basically :
from plemmy import LemmyHttp
lemmy = LemmyHttp('https://my.lemmy.instance')
lemmy.login('username','password')
lemmy.edit_community(community_id=XXX,banner="http:/yyy.tld/img.jpg")
Totally, not to mention setting a huge precedent on the path of a better SC. Don’t get me wrong, I definitely AM excited by LK99 ;)
There are actually people (e.g. https://www.twitch.tv/andrewmccalip) who are currently trying to replicate this. But from what early (internet) experts said, even if it works, is replicable and legit, it wouldn’t allow much current through it, about a quarter of amp. Still promising, but not as groundbreaking as initially put.
End users (so to speak) usally don’t buy full parmesan wheels, anyway ;)