[issue23103] ipaddress should be Flyweight

[Josh Rosenberg]

Josh Rosenberg added the comment:

Serhiy: I believe you need to add a bunch of __slots__ = () to various base classes in the module, even though they lack member variables. Every link in the inheritance chain must declare __slots__, or the child class will have __dict__ and __weakref__.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23103>
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