help with replacing charactersdef fix(block): alf = ['a', 'b', 'c', ' in a string

[volcano63]

Here are the issues in your code:

1. You always replace in the same block - overwriting get with the latest replacement operation result
   
2. You don't check crossing list boundaries
   
3. Remember p.1? It does not matter, because you exit after first iteration!
   
4. You may end up replacing character many times - if you replace 'a' with 'c', then you'll replace 'c' with 'e', etc
   
5. There are better ways to manage loop!
   
6. There is module string that contains ascii_lowercase constant - well, that you may not have known
   
7. Variable names - well, they are not very successful
   

Since you have shown some effort - here is the proper way to do it (I hope it is not homework)

from string import ascii_lowercase
def fix(word, char_offset=2):
    new_word = ''
    for char_ in word:
        # Get index of replacement character and keep it below 26, so for "z" it will be "b"
        char_index = ascii_lowercase.find(char_)
        if char_index > -1:
            replacement_index =  (char_index + char_offset) % 26
            new_word += ascii_lowercase[replacement_index]
         else:
            new_word += char_
    return new_word

PS I did not test the code - if there are some glitches, I leave fixing them to you as an excercise