题解 | 字符串变形

#
# 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
#
# 
# @param s string字符串 
# @param n int整型 
# @return string字符串
#
class Solution:
    def trans(self , s: str, n: int) -> str:
        # write code here
        s1 = ""
        for i in range(n):
            if s[i].islower():
                s1 += s[i].upper()
            else:
                s1 += s[i].lower()
        
        s2 = s1.split(" ")[::-1]

        s3 = " ".join(s2)

        return s3