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Since you can't specify the return code, `self.terminate` is less flexible than `sys.exit`.
I think the original intent is clear here, the method is there for the parent to control the child. You are of course welcome to argue otherwise.
By the way, I just read the code and noticed that it handles SystemExit well, and supports using it to set the return code:
 class X(Process):
 def run(self):
 if not frobulating:
 raise SystemExit(255)