At runtime, this raises TypeError:

What it does

Checks for classes that inherit from a dataclass with order=True.

Why is this bad?

When a dataclass has order=True, comparison methods (__lt__, __le__, __gt__, __ge__) are generated that compare instances as tuples of their fields. These methods raise a TypeError at runtime when comparing instances of different classes in the inheritance hierarchy, even if one is a subclass of the other.

This violates the Liskov Substitution Principle because child class instances cannot be used in all contexts where parent class instances are expected.

Example

from dataclasses import dataclass


@dataclass(order=True)
class Parent:
    value: int


class Child(Parent):  # error
    pass


# At runtime, this raises TypeError:
# Child(1) < Parent(2)

Consider using functools.total_ordering instead, which does not have this limitation.