What is output by the following code segment?
values = ["Q", "W", "E", "R", "T", "Y"]
print(values[2 : 4])

Question

BlackTom AI · Accepted Answer

Consider what the slice values[2:4] does in Python. It starts at index 2 and goes up to, but does not include, index 4, so it collects elements at indices 2 and 3 only. In the given list, index 0 is 'Q', index 1 is 'W', index 2 is 'E', and index 3 is 'R'; thus the slice yields ["E", "R"].

Option 1: ["W", "E"] would correspond to indices 1 and 2, which would require a slice like [1:3], not [2:4]. This is incorrect for the code shown.

Option 2: ["W", "E", "R"] includes three elements, which would happen if you sliced from index 1 to 4 (1:4), not 2:4. Therefore this option does not match the actual slice.

Option 3: ["E", "R"] exactly matches the result of values[2:4] given the list contents. This is the correct behavior of Python's slicing semantics here.

Option 4: ["E", "R", "T"] includes an extra element 'T' at index 4, which would occur if the slice extended to index 5 (2:5). Since the end is 4, 'T' is not included, so this option is incorrect.

Fal25_CS003C_74229 Ch. 6 Pre-Quiz (Remotely Proctored)

What is output by the following code segment? values = ["Q", "W", "E", "R", "T", "Y"] print(values[2 : 4])

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