What will be printed by the following Python code snippet?
x = [1, 2, 3]
y = [4, 5, 6]
print([a + b for a, b in zip(x, y)])
Answer and explanation
Correct answer: C. [5, 7, 9]
- Step 1: `zip(x, y)` pairs elements index by index: `(1, 4)`, `(2, 5)`, `(3, 6)`.
- Step 2: The comprehension computes `a + b` for each pair: , , , returning `[5, 7, 9]`.
Answer
[5, 7, 9].
Why not the others: `[1, 2, 3, 4, 5, 6]` is list concatenation `x + y`; `[4, 10, 18]` computes products `a * b`; `[(1, 4), ...]` is the raw zip output.
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