python __slots__
Understand __slots__ in Python
Variables or attributes not present in .__slots__ may not be defined. Furthermore, a slots class may not have default values.
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msg385064 - Date: 2021-01-14 09:14 Slot means so many different things in Python. Here it's about data descriptors created when you set __slots__ in the class definition.
UsingSlots - Python Wiki
slots__ are discussed in the Python Language Reference under section 3.3.2, Customizing Attribute Access. The first thing we should understand is that __slots__ is only used in the context of Python classes.