Python: using sys.exit or SystemExit differences and suggestions

Question

Reading online some programmers use sys.exit, others use SystemExit.
Sorry for the basic question:

1. What is the difference?
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Answer 1

SystemExit is an exception, which basically means that your progam had a behavior such that you want to stop it and raise an error. sys.exit is the function that you can call to exit from your program, possibily giving a return code to the system.

EDIT: they are indeed the same thing, so the only difference is in the logic behind in your program. An exception is some kind of "unwanted" behaviour, whether a call to a function is, from a programmer point of view, more of a "standard" action.