I've submitted PEP 591 (Adding a final qualifier to typing) for discussion to typing-sig [1].
Here's the abstract: This PEP proposes a "final" qualifier to be added to the ``typing`` module---in the form of a ``final`` decorator and a ``Final`` type annotation---to serve three related purposes: * Declaring that a method should not be overridden * Declaring that a class should not be subclassed * Declaring that a variable or attribute should not be reassigned Full text at https://www.python.org/dev/peps/pep-0591/ -sully [1] https://mail.python.org/mailman3/lists/typing-sig.python.org/
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