What is the expected output of the following code? ``python data = set([1, 2, 2, 3, 3, 3, 4, 4, 4, 4]) print(len(data)) ``

The correct answer is A. 4. set() removes duplicate values, so set([1, 2, 2, 3, 3, 3, 4, 4, 4, 4]) produces {1, 2, 3, 4} - four unique elements - making len(data) equal to 4 (A). Option C (10) is wrong because that's the length of the original list before deduplication; options B, E, and F (2, 1, 3) have…

Question

What is the expected output of the following code?

data = set([1, 2, 2, 3, 3, 3, 4, 4, 4, 4])
print(len(data))

Options

How the community answered

(25 responses)

A
80% (20)
B
4% (1)
E
12% (3)
F
4% (1)

Explanation

set() removes duplicate values, so set([1, 2, 2, 3, 3, 3, 4, 4, 4, 4]) produces {1, 2, 3, 4} - four unique elements - making len(data) equal to 4 (A). Option C (10) is wrong because that's the length of the original list before deduplication; options B, E, and F (2, 1, 3) have no basis in either the list or the set; option D (0) would only be correct for an empty set. Memory tip: Think of a set like a bag of unique coins - no matter how many duplicate pennies you drop in, you still only have one penny in the bag, so always count the distinct values, not the total insertions.

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