[Python-Dev] Re: Let's Fix Class Annotations -- And Maybe Annotations Generally

12.01.21 03:21, Larry Hastings пише:

I forgot about __slots__!  Yup, it's optional, and you can even delete it, though after the class is defined I'm not sure how much difference that makes.

It affects pickling if __slotnames__ is not set yet. The latter is set when you pickle or copy an instance the first time.