program termination and return value

[Scott Carlson]

Hi,

Python novice.  (But getting better.)

How do I terminate/quit my program during execution if I reach a point
where I desire to terminate the program?

How do I pass back an integer indicating (as example) an error number?

If I then do this, what do I put on the last line of my program to
return (for example) a zero, indicating success?

Thanks,
Scott