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I think there's a bit of a misunderstanding regarding exit. exit is not a keyword or a REPL command; it's actually a function exposed in the builtin package. you can run "import builtins; builtins.exit()"
To clarify, there are two things here: why exit exists in the REPL, and why it's a function. The exit() function is available only in the REPL, and it appears built-in, but it isn't part of the built-in namespace. Instead, exit is loaded automatically by the site module.
Heres is the code with the function site.main that is doing it: https://github.com/python/cpython/blob/8af84b503d0b62a3db0d8...
The line builtins.exit = _sitebuiltins.Quitter('exit', eof) shows that exit is set as a function. The Quitter class, which exit is an instance of, has a __call__ method, making it callable, so it as a function.
I don't believe you're wrong not understanding it; it's just that the process isn’t typically explained in detail, especially what happens when you start the REPL. This is why the message "Use exit() instead..." exists in the REPL: it needs that clarification.
In a nutshell, exit is a function loaded into the built-ins by the site.py module, which automatically activates when the REPL starts. This automatic loading is what makes exit, help, __copyright__ and others available only in the interactive sessions.