What will be the value of the variable list after the following code executes?
list = [1, 2, 3, 4]
list[3] = 10

Question

What will be the value of the variable list after the following code executes?
list = [1, 2, 3, 4]
list[3] = 10

BlackTom AI · Accepted Answer

Consider what the code is doing step by step. The list starts as [1, 2, 3, 4], and the statement list[3] = 10 targets the element at index 3. In Python, indexing is zero-based, so index 3 refers to the fourth element, which currently is 4. Replacing that element with 10 yields a new list: [1, 2, 3, 10].

Option 1: [1, 2, 3, 10] — This matches exactly the result described above, because only the last element is updated to 10 while the other elements remain unchanged.

Option 2: [1, 10, 10, 10] — This would require changing indices 1, 2, and 3 to 10, or a simultaneous replacement of multiple positions. The code only assigns a value to a single index, so this is incorrect.

Option 3: [1, 2, 10, 4] — This would imply that index 2 (the third element) was changed to 10, leaving the first two elements and the last one as before. However, the assignment targets index 3, not index 2.

Option 4: Nothing; this code is invalid — The operation list[3] = 10 is a valid in-place update of an existing list element in Python. Therefore, the assertion that the code is invalid is incorrect.

2261 CS 0012 SEC1010 Final Quiz

What will be the value of the variable list after the following code executes? list = [1, 2, 3, 4] list[3] = 10

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