install

pip3 install xprintidle

edit

open idle_command_runner.py with an text editor and change the CMD

running

python3 ./idle_command_runner.py

output

python3 ./idle_command_runner.py 
      10 of 300 sec of inactivity befor start command
      21 of 300 sec of inactivity befor start command
      32 of 300 sec of inactivity befor start command
      ...

      300 of 300 sec of inactivity befor start command
      start command

      ...
      1 of 300 sec of inactivity befor start command
      stop command