Restarting a program

[Geoldr]

Hello all, I have written a simple program, and at the end of it,
instead of it closing I would like it to restart from the beggining.
Is there a way to do this? Put my code into a class function, or
something?
I guess I could do a while loop, but I think if there is a way to run
my code if it's in a class would be an easier option. I can't seem to
find many guides online but maybe I have not been looking in the right
places.

Anybody have any ideas?