I don’t quite agree that for a beginer being presented with
sudo apt update && \
sudo apt install --yes software-properties-common && \
sudo add-apt-repository --yes ppa:deadsnakes/ppa && \
sudo apt install --yes python3.9
is better than
sudo apt update
sudo apt install software-properties-common
sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt install python3.9
All those symbols and “–yes” used to feel quite cryptic to me.
I’m very wary of it but It could have some potential thinking that the anti-monopoly action is pending.