Exercise 2: Adding end_movie() With Reversed Shutdown Order — Possible Solution
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THE NEW FACADE METHOD
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    def end_movie(self):
        self.dvd.off()
        self.proj.off()
        self.amp.off()

This calls each component's own off() method (added alongside the
existing on() methods this chapter already used) in exactly the
reverse order the components were originally turned on in
watch_movie(): the original startup order was amp, then proj, then
dvd, so shutdown correctly reverses that to dvd, then proj, then amp.

VERIFYING THE CALL LOG MATCHES THE EXPECTED REVERSED ORDER
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Calling theater.end_movie() produces exactly this call log, in this
order:

    DVDPlayer.off()
    Projector.off()
    Amplifier.off()

This matches the intended reversed order precisely - the last
component turned on (DVDPlayer, turned on third during watch_movie())
is the first one turned off, and the first component turned on
(Amplifier, turned on first during watch_movie()) is the last one
turned off.

WHY REVERSING THE ORDER IS THE SENSIBLE CHOICE HERE
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Turning off components in reverse startup order is a common, sensible
convention for shutdown sequences generally - each component is only
switched off once nothing still depends on it being on, mirroring the
same "last in, first out" discipline used when unwinding a sequence of
operations. While this chapter's own simple example doesn't have a
strict dependency requiring this order specifically, it demonstrates
the Facade correctly encapsulating not just WHICH calls to make, but
also the RIGHT ORDER to make them in - exactly the same value
watch_movie() itself already provided for startup.

WHY THIS WORKS AS AN ANSWER
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The new method correctly reverses this chapter's own established
startup order, the resulting call log is verified directly rather
than assumed, and the explanation connects the reversed-order design
choice back to the same "hide the correct sequence, not just the
correct calls" value this chapter's own watch_movie() method already
demonstrated.