Which function does in-place reversal of objects in a list?

Question

Options

• Alist.sort(func)
• Blist.pop(obj=list[-1])
• Clist.remove(obj)
• Dlist.reverse()

• A
  14% (3)
• B
  5% (1)
• C
  5% (1)
• D
  77% (17)

Explanation

list.reverse() performs an in-place reversal of all elements in a list, modifying the original list directly and returning None - exactly what "in-place reversal of objects" describes.

The distractors each do something different:

• A. list.sort(func) - sorts the list (optionally with a key function), not reversal
• B. list.pop(obj=list[-1]) - removes and returns the last element (or element at a given index); it doesn't accept an object as argument and doesn't reverse anything
• C. list.remove(obj) - removes the first occurrence of a specific value from the list; no reversal involved

Memory tip: Think of reverse() as "reversing the order" - the word itself is your clue. If you need the reversed version without mutating the original, use reversed() (a built-in) or slicing [::-1], but for in-place, list.reverse() is your answer.

No community discussion yet for this question.