string issue regarding python, basic introduction level

Question

I have a person calling a function with three inputs:

1. puzzle - so a random word, for example. 'john'
2. view - their view of the puzzle (they guess letters and they become revealed scoring points, etc) so lets say they only see j^h^ (^ represents hidden characters).
3. letter_guessed - they guess a letter, so if someone guessed 'o', the view would come back as 'joh^'

But my code just doesn't seem work and I can't seem to understand why, and please if you could do it using my bit of code below, I understand there are many ways to solve it but I'm interested in what I had to do if I wanted to solve this question using a for statement with nested if statements.

What it doesnt do: it simply displays the view again, the line of incorrect code is result = result + letter because i dont know how to make python scan for the hidden variable and replace the ^ with set found alphabetic letter.

def update_view(puzzle,view,letter_guessed):

    result = ""
    for index in range(0,len(puzzle)):
        if puzzle[index] == letter_guessed:
            result = result + letter_guessed
        else:           
            result = view
    return result 

Answer 1

If the letter is currently "^" and the letter was guessed correctly, you want to add the guessed letter to result. Else, you want to add whatever was on the view earlier

def guess(word, view, letter) :
    result = ""
    for i in range(0,len(word)) :
        if view[i] == "^" and word[i] == letter:
            result += word[i]
        else :
            result += view[i]

    return result

Demo

The above if-else condition can be further shortened using Python's true if condition else false construct

def guess(word, view, letter) :
    result = ""
    for i in range(0,len(word)) :
        result += word[i] if view[i] == "^" and word[i] == letter else view[i]      
    return result