can be useful to create a shortcut that allows you to switch between monitors / screens
If you have only one monitor, it can also be used to switch between tiled windows
install:
sudo apt install xdotool x11-xserver-utils
usage:
To set focus to left screen pass "left" as arg
python3 ./focus_changer.py left
To set focus to right screen pass "right" as arg
usage python3 ./focus_changer.py right