Question4 After running the code below, what is the value of variable nums? nums = [1, 2, 3] nums.insert(1, 5) nums.append(4) nums.append(5) print(nums) Select one alternative: [1, 2, 3, 5, 4, 5] [1, 5, 2, 3, 4, 5] [1, 2, 5, 3, 4] IndexError ResetMaximum marks: 2 Flag question undefined单项选择题
A
[1, 2, 3, 5, 4, 5]
B
[1, 5, 2, 3, 4, 5]
C
[1, 2, 5, 3, 4]
D
IndexError

Question

Question4 After running the code below, what is the value of variable nums? nums = [1, 2, 3] nums.insert(1, 5) nums.append(4) nums.append(5) print(nums) Select one alternative: [1, 2, 3, 5, 4, 5] [1, 5, 2, 3, 4, 5] [1, 2, 5, 3, 4] IndexError ResetMaximum marks: 2 Flag question undefined单项选择题

A

[1, 2, 3, 5, 4, 5]

B

[1, 5, 2, 3, 4, 5]

C

[1, 2, 5, 3, 4]

D

IndexError

BlackTom AI · Accepted Answer

We start with the given code and track how the list changes step by step.
Option analysis will consider what each listed final state would imply.
Option A: "[1, 2, 3, 5, 4, 5]". This would correspond to inserting 5 at index 3 (which would place 5 after 3), or performing a sequence that somehow leaves the original elements in their initial order with 5 inserted later in an incorrect position. However, after nums.insert(1, 5), the element 5 is placed at index 1, shifting 2, 3 to the right. Therefore, the sequence cannot remain [1, 2, 3, ...] at the front. This option ignores the actual effect of insert which changes the positions of existing elements.
Option B: "[1, 5, 2, 3, 4, 5]". This matches the logical steps: starting from [1, 2, 3], insert(1, 5) yields [1, 5, 2, 3]. Then append(4) adds 4 to the end, giving [1, 5, 2, 3, 4]. Finally append(5) adds another 5 at the end, producing [1, 5, 2, 3, 4, 5]. This sequence is consistent with Python list methods and order preservation. The trailing comma and spacing in the option reflect the printed representation including the final newline in some environments, which is acceptable in this context.
Option C: "[1, 2, 5, 3, 4]". This would imply that the insert placed 5 between 2 and 3 without shifting 2 and 3 to the right, which contradicts how insert works in Python (it shifts existing elements to accommodate the new value). It also omits the second appended 5, and misses the second append that would add another element to the end.
Option D: "IndexError". An IndexError would occur if an invalid index were used in insert or append, but insert and append do not raise IndexError for these operations on a standard list; insert accepts any index (it clamps to ends) and append always adds to the end. Therefore, this option is incorrect for the given code sequence.
In summary, only the second option aligns with the actual sequence of operations and their effects on the list: insert at index 1 inserts 5 before the current element at that position, then two appends add 4 and 5 to the end, yielding [1, 5, 2, 3, 4, 5].

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