Custom Python Strings: Inheriting From str vs UserString – Real Python

In this tutorial, you'll learn how to create custom string-like classes in Python by inheriting from the built-in str class or by subclassing UserString from the collections module.
In this tutorial, you'll learn how to create custom string-like classes in Python by inheriting from the built-in str class or by subclassing UserString from the collections module.

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Python strings are immutable, but only sometimes - Austin Z. Henley

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Python The Complete Manual First Edition, PDF