面试题58：翻转字符串

# -*- coding:utf-8 -*-
class Solution:
    def ReverseSentence(self, s):
        # write code here
        # 先边界条件
        if not s:
            return s
        # 注意：s.split(" ") 这个的必要性  
        s = list([i for i in s.split(" ")])
        res = s[::-1]
        return " ".join(res)

　　采用：reverse()

def ReverseSentence(s):
        word = s.split(' ')
        word.reverse()
        return ' '.join(word)