class Solution:

     # @param s, a string

     # @return a string

     def reverseWords(self, s):

         ss = s.split(" ")

         ss = filter(lambda x:x!="",ss)

         l = len(ss)

         for i in range(l/2):

             ss[i],ss[l-1-i] = ss[l-1-i],ss[i]

         s = (" ").join(ss)

         return s

为了去掉''字符，尝试了好几种方法，最后还是用filter函数将其过滤掉了。

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