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Mon Apr 15 19:58:07 EDT 2019 · https://mail.python.org/pipermail/python-dev/2019-April/157108.html

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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[Python-Dev] PEP 591 discussion (final qualifier) happening at typing-sig@