leetcode:Reverse Words in a String【Python版】

 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。