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Quick Tip: Use `__slots__` to reduce Python class memory usage (2026)

Quick Tip: Use slots to reduce Python class memory usage

When creating classes in Python, you might not think about the memory implications. However, using the __slots__ attribute can significantly reduce memory usage.

In regular Python classes, each instance has a __dict__ attribute that stores its attributes as key-value pairs. This allows for dynamic attribute creation, but it comes at a cost: memory usage. On the other hand, classes that use __slots__ store their attributes in a fixed-size array, eliminating the need for __dict__.

Here's a minimal example:


python
import sys

class RegularClass:
    def __init__(self, x, y):
        self.x =

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