Python: List Reversing on One Line [duplicate]

Question

ls = list(range(10))
ls.reverse()
print(ls)

Why does this work in producing a list that counts backwards from 9 not but not this:

ls = list(range(10)).reverse()
print(ls)

These last two lines prints this instead:

None

Shouldn't they be the same thing?

Answer 1

No, because list.reverse() returns None since it reverses the list in place. See the list documentation

You could use reversed() like so:

countdown = list(reversed(range(10)))
print(countdown)

See the reversed documenation

See also this question