Python 字符串大小写转换函数 - 代码示例

def change_case(string):\n changed_string = ""\n for char in string:\n if char.isupper():\n changed_string += char.lower()\n elif char.islower():\n changed_string += char.upper()\n else:\n changed_string += char\n return changed_string\n\ndef main():\n original_string = input("请输入原字符串：")\n transformed_string = change_case(original_string)\n print("变换后的字符串为：", transformed_string)\n\nmain()