Overview

attrs 25.2, released on March 12, 2025, speeds up class creation by 30-50%.

Main Features

Faster class creation

Internal optimization of __init__, __eq__, and __repr__ generation reduces attrs class creation time by 30-50%.

python 
import attrs

@attrs.define
class Point:
    x: float
    y: float
    z: float = 0.0

# Creation 30-50% faster than before
p = Point(1.0, 2.0)
print(p)  # Point(x=1.0, y=2.0, z=0.0)

Sources