Using list slicing, how would you print ['a', 'b', 'c', 'd', 'e'] given the following list?

li = ['a', 'b', 'c', 'd', 'e', 'f']

Question

Using list slicing, how would you print ['a', 'b', 'c', 'd', 'e'] given the following list?

li = ['a', 'b', 'c', 'd', 'e', 'f']

BlackTom AI · Accepted Answer

Question: Using list slicing, how would you print ['a', 'b', 'c', 'd', 'e'] given the following list?

li = ['a', 'b', 'c', 'd', 'e', 'f']

Options:
- print(li[::5])
- print(li[5:])
- print(li[5])
- print(li[:5])

Option 1: print(li[::5]). This uses a slice with a start of 0 (implicit), no end (implicit), and a step of 5. It would select elements at indices 0, 5, 10, ... up to the end of the list. In this list, that yields ['a', 'f'], not the full five-element sequence requested. Therefore this is incorrect.

Option 2: print(li[5:]). This starts at index 5 and goes to the end of the list. That would produce ['f'], a single element, not ['a', 'b', 'c', 'd', 'e']. This is incorrect because it omits the initial elements and only returns from 'f' onward.

Option 3: print(li[5]). This accesses the single element at index 5, which is 'f'. It does not produce a list and certainly not the requested five-element slice. This is incorrect for two reasons: it returns a scalar, not a sublist.

Option 4: print(li[:5]). This uses a slice with a start of 0 (implicit) and an end of 5 (exclusive). It selects elements at indices 0 through 4, which correspond to 'a', 'b', 'c', 'd', 'e'. This exactly matches the desired output ['a', 'b', 'c', 'd', 'e']. Therefore this is the correct choice.

In summary, understanding Python list slicing shows that [:5] captures elements from the start up to (but not including) index 5, yielding the five-element prefix of the list, which is the target output. The other options either select elements with an incorrect range, or pick a single element, or use a step that skips most of the list. Hence, the correct option is print(li[:5]).

4510_COMP_SCI_X_0010 W05 Quiz

Using list slicing, how would you print ['a', 'b', 'c', 'd', 'e'] given the following list? li = ['a', 'b', 'c', 'd', 'e', 'f']

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