The hplip package prior to version 3.20.3-2 was missing the compiled python modules. This has been fixed in 3.20.3-2, so the upgrade will need to overwrite the untracked pyc files that were created. If you get errors such as these

hplip: /usr/share/hplip/base/__pycache__/__init__.cpython-38.pyc exists in filesystem hplip: /usr/share/hplip/base/__pycache__/avahi.cpython-38.pyc exists in filesystem hplip: /usr/share/hplip/base/__pycache__/codes.cpython-38.pyc exists in filesystem ...many more...

when updating, use

pacman -Suy --overwrite /usr/share/hplip/*

to perform the upgrade.

URL: https://www.archlinux.org/news/hplip-3203-2-update-requires-manual-intervent...