find() versus index() in Python

find.py

# find() doesn't return an exception, and is perhaps better suited for cases
# where we don't know if the substring exists; it returns -1 if not found
# index() will throw a ValueError exception if the value being searched for doesn't exist
class Solution:
    def reversePrefix(self, word: str, ch: str) -> str:
        return word[:word.find(ch) + 1][::-1] + word[word.find(ch) + 1:]
# this problem says to reverse the part of the string from 0 to first occurence of character
# then return that reversed output with the rest of the string