Assuming you have a Python script server.py that you want to auto-reload every time the file changes, use the following script using nodemon:
nodemon -w . --exec python server.py
The -w . tells nodemon files to watch for changes of all files in the current directory (.)
I generally recommend creating a script start.sh to automatically run this command:
#!/bin/sh nodemon -w . --exec python server.py
and then make it executable using
chmod a+x start.sh
Now you can run it using
./start.sh