2000. Reverse Prefix of Word

Level: Easy

https://leetcode.com/problems/reverse-prefix-of-word/

class Solution:
    def reversePrefix(self, word: str, ch: str) -> str:
        i = word.find(ch)
        if i == -1:
            return word
        return word[:i + 1][::-1] + word[i + 1:]

String item assignment is not allowed in Python (e.g. a[0] = 'b'), so I used string concatenation instead.