Consider the following code segment:

x = [5, 3, 7, 9, 1]

y = x[3 : ]

print(y)

What is displayed when it executes?

Question

Consider the following code segment:

x = [5, 3, 7, 9, 1]

y = x[3 : ]

print(y)

What is displayed when it executes?

BlackTom AI · Accepted Answer

The code defines a list x as [5, 3, 7, 9, 1], and then creates y by taking a slice of x starting at index 3 to the end with x[3:].
To understand the slice, recall the indices: 0->5, 1->3, 2->7, 3->9, 4->1.
Starting at index 3 yields the sublist [9, 1], which includes the element at index 3 and all subsequent elements.
Now evaluate each option:
- Option '[9]': This would correspond to stopping the slice before including the element at index 4, which is not how x[3:] works since it includes all items from index 3 onward.
- Option '[9, 1]': This matches exactly the slice result from x[3:], containing elements at indices 3 and 4 in order.
- Option '[3, 7, 9, 1]': This would be the slice starting at index 1 (x[1:]), not starting at index 3, so it’s incorrect.
- Option '[5, 3, 7, 9]': This would be the slice from the start up to index 4 (x[:4]), which is not what x[3:] yields.
Consideration of edge cases: if the slice were empty or started beyond the end, you’d get [], but here the start is 3 and the list has length 5, so two elements are included.
Therefore, the displayed output corresponds to the slice [9, 1], as shown by x[3:].

Consider the following code segment: x = [5, 3, 7, 9, 1] y = x[3 : ] print(y) What is displayed when it executes?单项选择题

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