class-as-data-structure (B903)

Derived from the flake8-bugbear linter.

This rule is unstable and in preview. The --preview flag is required for use.

What it does

Checks for classes that only have a public __init__ method, without base classes and decorators.

Classes with just an __init__ are possibly better off being a dataclass or a namedtuple, which have less boilerplate.

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

Use instead:

from dataclasses import dataclass


@dataclass
class Point:
    x: float
    y: float