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    OP points out in the question description that he's looking for something more efficient than ''.join(list). He's also asking specifically for a library which provides mutable strings in Python (or some other approach to attain it). – Please revise your answer and explain why doing it in this way is still worthwhile from your perspective. Also giving an explanation rather than just do this is much more helpful for future readers. See also the contribution guide for reference. Commented Oct 20, 2020 at 11:12