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What does __slots__ do?

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01

Understand the problem

Explain slots.

slots
02

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03

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Defining __slots__ tells a class to store its attributes in a fixed, compact structure instead of a per-instance __dict__, saving memory and slightly speeding attribute access — useful when creating millions of small objects. The trade-off: you can't add arbitrary new attributes.

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04

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PYSlots block stray attributes and shrink instances
05

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