Plzzz explain why use [0]

Question

s = [100,84,63,97]
s_sort = s.sort()
print(s[::-1][0])

Answer 1

It first reverses the list and then [0] prints the element at first position

Answer 2

The use of [0] here is meant to only pass the first list item (instead of the list itself) for `print` function to work with. The [0[ specifies the list item index (the first list item's index is zero)