Web Reference: Aug 12, 2023 · You can add slots to your class adding a single line of code but is this always a good idea? In this article we’ll look a why and how using slots make your classes that much faster and when to use them. The __slots__ attribute in Python is a class-level attribute that explicitly declares which instance attributes a class can have, replacing the default dictionary-based storage with a more memory-efficient fixed structure. Jul 23, 2025 · The __slots__ attribute in Python allows you to explicitly declare the attributes a class can have. By using __slots__, you can reduce memory overhead as Python no longer needs to create a dictionary for each instance to store attribute names and values.
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