示例：
输入： "Hello World" 输出：" World Hello" 输入： "ni hao xiaoming" 输出：" xiaoming hao ni"
import re
def reverseWords(s):
return re.sub(" "," "," ".join(s.split(" ")[::-1]))
reverseWords("ni hao a")
示例：
输入： "Hello World" 输出：" World Hello" 输入： "ni hao xiaoming" 输出：" xiaoming hao ni"
import re
def reverseWords(s):
return re.sub(" "," "," ".join(s.split(" ")[::-1]))
reverseWords("ni hao a")
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