Published Aug 12, 2022
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__slots__ allow us to explicitly declare data members (like properties) and
deny the creation of __dict__ and __weakref__ (unless explicitly declared in
__slots__ or available in a parent.)
The space saved over using __dict__ can be significant. Attribute lookup speed
can be significantly improved as well.
object.__slots__
__slots__ reserves space for the declared variables and prevents the automatic creation of __dict__ and __weakref__ for each instance.