Challenge 1: Reverse Words — Possible Solution
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sentence = "Python is fun"

words = sentence.split()       # ['Python', 'is', 'fun']
reversed_words = words[::-1]   # ['fun', 'is', 'Python']
result = " ".join(reversed_words)

print(result)

Output:
fun is Python

WHY THIS WORKS AS AN ANSWER
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sentence.split() with no arguments splits on whitespace by default,
producing the list ['Python', 'is', 'fun'] — the chapter's own
.split() example used an explicit separator, but calling it with no
arguments at all is the common default form for splitting on words.

words[::-1] reuses the exact same slice pattern from the chapter's
string-reversal example (s[::-1]), except applied to a list instead
of a string — slicing with a step of -1 works identically on any
sequence type, reversing it front to back.

" ".join(reversed_words) then reassembles the reversed list back into
a single string, with a single space as the separator living on the
join() call itself — exactly the "join() lives on the separator, not
the list" pattern the chapter's tip-box called out.