index(subsring, beginIndex, endIndex)

index is a string helper. You call it on text like "Asha" or "banana". It gives a new string (or a number/True-False). The old string does not change unless you assign the result back.

index(subsring, beginIndex, endIndex) — output: 1. Missing would raise ValueError (unlike find).

Fresher trap: writing s.index() and expecting s to update. Strings are immutable. Write s = s.index(...) if you need the new value (when it returns a string).