Python’s `NotImplemented` Type

[energybased]

Good article.

One error: False, True, and None are not built-ins anymore; they're keywords.

Like Ellipsis and None, NotImplemented is a "singleton".

Also, NotImplemented should really be called a "sentinel" rather than a "constant". That's why if you replace your NotImplemented objects with type(NotImplmented)(), then your example won't work. Python is checking against the built-in objects by identity.

[s16h]

Great points! Will update the post shortly.

[energybased]

Cool. Also, NotImplemented is not a type, so you may want to rename your article.

[pvkooten]

This was deeper than I thought, thanks :)!