LC58. Length of Last Word

class Solution:
    def lengthOfLastWord(self, s: str) -> int:
        s = s.rstrip()
        return len(s[s.rfind(' ') + 1:])

class Solution:
    def lengthOfLastWord(self, s: str) -> int:
        return len(s.split()[-1])

Complexity

Time: $O(n)$
Space: $O(n)$