I have a very long running Python program that I can manually start (and stop) from the command line. I do not want this program started automatically during system boot. But, after I manually start it running, I would like a way for my Pi to restart this Python program running again if it ever stops or exits for any reason, even if I'm logged out of my Pi. How can I do this?
If you have something you want to run for a long period you can use a terminal multiplexer like screen or tmux. They will continue to run after you have been disconnected from your Pi. As for keeping a process running for long running jobs you will want to wrap the command in a simple shell script. If you want to keep it a pure python code base you may want the process to run as a daemon. This is a great and very well documented example
