LeetCode:Reverse Words in a String

Given an input string, reverse the string word by word.

For example,
Given s = "the sky is blue",
return "blue is sky the".

click to show clarification.

Clarification:

• What constitutes a word?
  A sequence of non-space characters constitutes a word.
• Could the input string contain leading or trailing spaces?
  Yes. However, your reversed string should not contain leading or trailing spaces.
• How about multiple spaces between two words?
  Reduce them to a single space in the reversed string.

Python比较简单。。。本身提供的函数就能满足。。。

class Solution:
    # @param s, a string
    # @return a string
    def reverseWords(self, s):
        s=s.split() #按空格分割，不管中间几个空格，返回列表
        s.reverse() #列表倒置       
        s=' '.join(s)#把空格插入。。。
        return s