题解 | #字符串变形#

#直接用split()碰到空格开头或结尾的会少一个空字符串，要用split(' ')
class Solution:
    def trans(self, s, n):
        l = s.split(' ')  
        l = l[::-1]
        s = ""
        for letter in l:
            letter = letter.swapcase()      # 调整大小写
            s += letter                     # 重新串成一个字符串
            s += ' '
        return s[0:len(s)-1]