1 class Solution: 2     # @param s, a string 3     # @return a string 4     def reverseWords(self, s): 5         ss = s.split(" ") 6         ss = filter(lambda x:x!="",ss) 7         l = len(ss) 8         for i in range(l/2): 9             ss[i],ss[l-1-i] = ss[l-1-i],ss[i]10         s = (" ").join(ss)11         return s