What Is __ Slots __ in Python?

Python’s __slots__ are a way to tell the interpreter to not use a dictionary for storing an instance’s attributes. This saves memory.

A class can only have a limited number of __slots__, so it’s important to use them wisely.

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When Should You Use Slots?

If you’re working with large numbers of instances, and you’re concerned about memory usage, then you should consider using slots. If you don’t care about memory usage, then there’s no need to use slots.

How Do Slots Work?

The __slots__ variable is a tuple of strings that specifies the attributes that can be stored in the instance. The interpreter will then use a special singleton class to store the attributes.

This saves memory because the interpreter doesn’t have to create a dictionary for each instance.

What Are the Disadvantages of Slots?

Slots can make your code harder to understand and maintain. They also make it harder to subclass your classes.

If you need to subclass your classes, then you should probably avoid using slots.