第11个点居然输入空字符串卡我
直接try特判

class Solution(object):
    def reverseWords(self, s):
        try:
            a=s.split()
            b=""
            for i in range(1,len(a)):
               b=str(b)+str(a[-int(i)])+" "
            return str(b)+a[0]
        except:
            return ""