Challenge 3: Walrus in a Loop-Free Context — Possible Solution
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text = "Hello, Python world!"

if (length := len(text)) > 10:
    print(f"Too long: {length} characters")

Output:
Too long: 21 characters

WHY THIS WORKS AS AN ANSWER
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(length := len(text)) does two things in a single expression, exactly
this chapter's walrus-operator explanation: it calls len(text) once,
ASSIGNS that result to the new variable length, and the if condition
then evaluates whether that same assigned value is greater than 10 —
all without a separate assignment line written before the if, and
without calling len(text) a second time inside the print() call.

Without the walrus operator, achieving the same result would require
either two lines (length = len(text) on its own line, then a separate
if length > 10:), or calling len(text) twice — once inside the
condition, once again inside the f-string — exactly the repeated-call
inefficiency this chapter's own list-length example was built to
avoid.

The parentheses around length := len(text) are required syntax — the
walrus assignment needs to be wrapped in parentheses when used inline
inside an if condition like this, distinguishing it clearly from a
plain comparison.