Is there an efficient way to overwrite a string at index with another string?

Question

I'm trying to overwrite a string with another string (from an index), in Python 3.x. I want to know if there is already a String method that can already do this or if there is an efficient way to do this.

I know the easiest way to achieve this would be to write a loop that starts at an index and then replaces each character of string a with string b (shown in code below).

def func(a, b, index):
    newStr = list(a)
    for i in range(index, index+len(b)):
        if i < len(a):
            newStr[i] = b[i-index]
        else:
            newStr.append(b[i-index])
    return ''.join(newStr)

If I have two strings string: a = '012345678' and b = 'abcde'

And the index set as 6, then the expected output from the function should be: '012345abcde'.

Note that strings in Python are immutable. You cannot overwrite them. But you can combine (parts of) strings into a new string, which is what skymon's answer does. — Roland Smith
– Roland Smith, Commented Aug 18, 2019 at 9:58

skymon · Accepted Answer · 2019-08-18 09:53:57Z

2

You could do:

def func(a, b, index):
    return a[:index] + b

answered Aug 18, 2019 at 9:53

skymon

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