Exercise 8: Reorder with .format() — Possible Solution
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first = "Grace"
last = "Hopper"

print("{1}, {0}".format(first, last))
print("{0} {1}".format(first, last))

Output:
Hopper, Grace
Grace Hopper

WHY THIS WORKS AS AN ANSWER
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{0} always refers to .format()'s first argument (first) and {1}
always refers to its second (last), regardless of the order the
placeholders appear in the string itself. The first print() puts {1}
before {0}, so last prints first — "Hopper, Grace" — without touching
the order the arguments were passed in. The second print() simply
uses {0} then {1} in that order, giving "Grace Hopper". This is the
one genuine advantage indexed .format() placeholders have over a
plain f-string: the same two variables can be rearranged, or even
reused more than once, just by changing the numbers inside the { }
without re-writing the expression each time.