PEP 661 -- Sentinel Values

This page summarizes the projects mentioned and recommended in the original post on /r/Python

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  1. reader

    A Python feed reader library. (by lemon24)

    The exact same problems None has when it's not a valid value. None is different from the variable type, that's why you have Optional[VarType], which is an alias for Union[VarType, None]; you can model this in exactly the same way: Union[VarType, MissingType]; here's an example.

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  3. Werkzeug

    The comprehensive WSGI web application library.

    Werkzeug (library used by Flask) had a repr for its sentinel long before getting type annotations.

  4. attrs

    Python Classes Without Boilerplate

    attrs has at least two.

  5. peps

    Python Enhancement Proposals

    A lot of PEPs get abandoned/rejected, or postponed (and this is fine, that's how the process is supposed to work).

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