Which list comprehension below would generate the following output?

[0, 1, 4, 9, 16, 25, 36, 0, 0, 0]

Question

Which list comprehension below would generate the following output?

[0, 1, 4, 9, 16, 25, 36, 0, 0, 0]

BlackTom AI · Accepted Answer

To tackle this question, I’ll examine what the target output looks like and then evaluate each candidate comprehension. First, the desired list is [0, 1, 4, 9, 16, 25, 36, 0, 0, 0]. This means: for indices 0 through 6, we should get i squared (i**2), and for indices 7 through 9, the value should be 0. Option 1: [0 if i>6 else i**2 for i in range(11)]. Here, the range goes from 0 to 10, giving eleven elements. For i from 0 to 6 (inclusive), we compute i**2, which yields 0,1,4,9,16,25,36 as expected. However, for i = 7, 8, 9, 10, the expression returns 0 because i>6 is true. That would produce [0, 1, 4, 9, 16, 25, 36, 0, 0, 0, 0], i.e., four trailing zeros and an extra element, not matching the target length or pattern. Option 2: [i**2 if i<6 else 0 for i in range(10)]. This also iterates i from 0 to 9, but changes the boundary: i<6 is true for i = 0,1,2,3,4,5, producing 0,1,4,9,16,25, and for i = 6,7,8,9 it yields 0. The resulting sequence is [0, 1, 4, 9, 16, 25, 0, 0, 0, 0], which diverges from the target in both the position of the zero tail and the presence of a nonzero 36. Option 3: [0 if i>6 else i**2 for i in range(10)]. This keeps i in the 0..9 range and applies i**2 as long as i <= 6, because i>6 becomes true only for i = 7, 8, 9. Consequently, the values are 0 (for i=0 gives 0 anyway), 1, 4, 9, 16, 25, 36 for i=6, and then 0 for i=7, 8, 9 due to the conditional. This yields [0, 1, 4, 9, 16, 25, 36, 0, 0, 0], exactly matching the target output. In summary, Option 1 miscounts the length and introduces extra trailing zeros, option 2 shifts the zero tail and omits the 36, whereas Option 3 correctly applies the square for indices up to 6 and switches to 0 afterward, producing the requested sequence.

Which list comprehension below would generate the following output? [0, 1, 4, 9, 16, 25, 36, 0, 0, 0] 单项选择题

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