Most code works perfectly fine indexing bytes in a UTF-8 string. Anything that looks for stuff in the ASCII range such as parsers would not need to be changed.

Most code works perfectly fine indexing bytes in a UTF-8 string. Anything that looks for stuff in the ASCII range such as parsers would not need to be changed. Python 3 already required all code to be looked over because of the string literal change so it wouldn't be much different.