What is the expected output of the following code? ``python data = [1, 2, 3, None, (), [], [] ] print(len(data)) ``

Question

data = [1, 2, 3, None, (), [], [] ]
print(len(data))

Options

• A4
• B6
• C5
• D3

• A
  6% (3)
• B
  83% (45)
• C
  9% (5)
• D
  2% (1)

Explanation

Note on the question as written: The list as shown - [1, 2, 3, None, (), [], []] - actually contains 7 elements (the trailing [] appears twice), so running this exact code would print 7, not 6. This appears to be a typo in the question; the intended list was likely [1, 2, 3, None, (), []] with 6 elements.

Explaining the intended question (6-element list):

len() counts the number of top-level items in a list, regardless of their value or "truthiness" - None, the empty tuple (), and the empty list [] are all fully valid list elements and each count as one. This is the core insight: option B (6) is correct because the list contains exactly 6 objects separated by commas.

The distractors exploit a common misconception: A (4) and D (3) suggest that "falsy" values like None, (), and [] are somehow ignored - they are not. C (5) likely comes from miscounting, perhaps collapsing () and [] as "the same thing."

Memory tip: len() counts containers, not contents - an empty box is still a box. If you can type it between commas in a list literal, len() counts it.

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