Restarting a self-updating python script

Question

I have written a script that will keep itself up to date by downloading the latest version from a website and overwriting the running script.

I am not sure what the

Answer 1

Main File:

if __name__ == '__main__':

if os.path.isfile('__config.py'):
    print 'Development'
    push.update_server()
else:
    e = update.check()
    if not e: sys.exit()

Update File:

def check():
    e = 1.....perform checks, if something needs updating, e=0;
    if not e:
        os.system("python main.pyw")
    return e

Here's the logic:

Main program calls the update function

1) If the update function needs to update, than it updates and calls a new instances of "main"

Then the original instance of "main" exits.

2) If the update function does not need to update, then "main" continues to run