What is the expected output of the following code? ``python data = ((1, 2,)) * 7 print(len(data[3:8])) ``

Question

data = ((1, 2,)) * 7
print(len(data[3:8]))

Options

• AThe code is erroneous.
• B6
• C5
• D4

• A
  5% (1)
• B
  20% (4)
• C
  5% (1)
• D
  70% (14)

Explanation

There is a likely error in the exam key - the actual Python output is 5 (option C), not 4.

Here's the step-by-step breakdown:

1. (1, 2,) - a tuple with 2 elements; the trailing comma is valid and doesn't add an element.
2. ((1, 2,)) - the outer parentheses are grouping only (no trailing comma), so this is still (1, 2).
3. (1, 2) * 7 produces a 14-element flat tuple: (1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2).
4. data[3:8] slices indices 3–7 inclusive → 5 elements → len = 5.

Why D (4) is wrong as stated: D would be correct if data had 7 elements. That would only happen if the code used ((1, 2,),) * 7 - a 1-element tuple (tuple-of-tuple) repeated 7 times, giving data[3:8] only 4 reachable indices (3, 4, 5, 6). The exam likely intended that version.

Why other distractors are wrong: A is wrong because the code runs without error. B (6) doesn't correspond to any plausible slice length here. C (5) is actually the correct Python answer.

Memory tip: To create a tuple containing a tuple, you need a trailing comma on the outer: ((1, 2),). Without it, extra parentheses are just grouping - Python ignores them. When you see * N on a tuple, always flatten mentally first, then slice.

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