Streamlining the execution of Python scripts

In recent months, I've been dabbling in a bit of Python. It's easy to get to grips with, and the syntax is clean. Closely following a variety of tutorials, I'd simply write some code in hello-world.py, then execute it like so:

chris@chris-book:~$ python3 hello-world.py

This would work, and I thought that's just how you ran the code. Anyway, while starting a new course, I just discovered that you can streamline this process using a shebang:

1. Make the file executable using chmod (make sure you consider which users/groups should be permitted to do this, obviously)

2. Append #!/bin/python3 to the start of the file

    #!/bin/python3
    print("Hello World");
   

3. Execute the file

    chris@chris-book:~$ ./hello-world.py
    Hello World
   

Keep in mind that you can do this with other program files too.