Insert some string into given string at given index

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An important point that often bites new Python programmers but the other posters haven’t made explicit is that strings in Python are immutable — you can’t ever modify them in place.

You need to retrain yourself when working with strings in Python so that instead of thinking, “How can I modify this string?” instead you’re thinking “how can I create a new string that has some pieces from this one I’ve already gotten?”

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