题目：

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

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

代码：oj在线测试通过 Runtime: 172 ms

 class Solution:

     # @param s, a string

     # @return a string

     def reverseWords(self, s):

         words = s.split(' ')

         if len(words) < 2 :

             return s

         tmp = ""

         for word in words:

             word = word.replace(' ','')

             if word != "" :

                 tmp = word + " " + tmp

         tmp = tmp.strip()

         return tmp

思路：

把中间多个空格考虑去除了就OK了

最后用strip()函数把首位的空白去了

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