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
        def transtr(str):
            if 97 <= ord(str) <= 122:
                str = chr(ord(str) - 32)
            elif 65 <= ord(str) <= 90:
                str = chr(ord(str) + 32)
            return str
        
        ans = ''
        flag = None
        for i in range(1, len(s) + 1):
            if s[-i]==' ':
                if i == 1:
                    ans+=' '
                    flag = -i
                    continue
                for j in s[-i + 1:flag]:
                    ans += transtr(j)
                ans += ' '
                flag = -i
        if not s[0]==' ':
            for j in s[0:flag]:
                ans += transtr(j)
        return ans