查找字符串中子字符串的最后一次出现，将其替换 [英] Finding last occurrence of substring in string, replacing that

问题描述

所以我有一长串相同格式的字符串，我想找到最后一个".字符中的每个字符，然后将其替换为.-".我已经尝试过使用rfind，但似乎无法正确地利用它来执行此操作.

So I have a long list of strings in the same format, and I want to find the last "." character in each one, and replace it with ". - ". I've tried using rfind, but I can't seem to utilize it properly to do this.

推荐答案

这应该做到

old_string = "this is going to have a full stop. some written sstuff!"
k = old_string.rfind(".")
new_string = old_string[:k] + ". - " + old_string[k+1:]

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