• What constitutes a word?
  A sequence of non-space characters constitutes a word.
• Could the input string contain leading or trailing spaces?
  Yes. However, your reversed string should not contain leading or trailing spaces.
• How about multiple spaces between two words?
  Reduce them to a single space in the reversed string.

原题链接: https://oj.leetcode.com/problems/reverse-words-in-a-string/

题目大意: 将句子中的单词逆序

思路: 注意clarification中的情况, 养成注意细节的习惯

 1 class Solution:
 2     # @param s, a string
 3     # @return a string
 4     def reverseWords(self, s):
 5         s = s.strip().split(‘ ‘) #strip eliminate pre and trail white spaces
 6 
 7         #eliminate useless white spaces between words
 8         for i in range(0, s.count(‘‘)):
 9             s.remove(‘‘)
10 
11         s.reverse()
12 
13         return ‘ ‘.join(s)