您的行remove_dups(s,ind)是问题.它不对返回的值做任何事情.如果您仔细阅读了代码，则在顶层函数调用中，将在顶部分配s=text，然后在底部返回s，而无需修改s的值.提示是，在打印正确答案后，您将最后打印原始文本.
尝试s = remove_dups(s, ind)

Your line remove_dups(s,ind) is the problem. It's not doing anything with the returned value. If you read through your code, in the top level function call you're assigning s=text at the top, then returning s at the bottom, without ever modifying the value of s. The clue is that you're printing the original text last, after you've printed the correct answer.
Try s = remove_dups(s, ind)