For example, if your string contains both 1 and 0, and you replace 1 with I, that might create a situation where another part of the string (e.g., something containing 10) is now altered in an unexpected way when 0 is replaced with O.

What does unstable mean in this context?

very good

It works perfectly for everyone. Not sure where you're getting an error.

you should have handled array overflow

THIS METHORD IS WRONG!
ERROR

Not the best practice cuz any other type of n then int will return -1.

Didn't event think of catching errors on these fundamental tasks...I like it.

Not the best practice as any other errors that are not due to IndexErrors will still return -1. Its best to return -1 ONLY when index is out of range.

Got it. Thank you very much for your help!

Josh

hmm.. i think you need to get some undrstanding of pass by value / pass by reference in general. And how it works in python.

You can check something like this: https://www.geeksforgeeks.org/pass-by-reference-vs-value-in-python/

Hope you'll answer your own questions after this =)

I'm a little confused by array[n].

Isn't this used to look up in a list/dict?

array is a parameter. Don't we need to create a list first?

I'm new at this.

Thank you very much!

Josh