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> Whatever logic currently used to print the 'Use quit() or Ctrl-Z plus Return to exit' message could also... quit the REPL in the first place, right?

That one would probably be somewhat risky actually, that message is the "repr" of the quit object/function, displaying results at the repl invokes repr… but so does printing most containers, so e.g. `vars(__builtins__)` (to get a quick list of the builtins) would also quit the repl, which would be undesirable.

There is no special logic behind it. It just prints the value of the variable with the name "quit", the same way it would print the value of the variable "foo" if you typed "foo".

The repl's basically supposed to help you write a program by matching the behavior of Python itself. What if I've got a variable called "quit" and I want to check its value?

The repl treats it specially because "quit", taken out of the context of the repl, makes sense as something to type in when trying to quit an unfamiliar program, not because actual Python programmers are likely to type it often.