classes_override error

Incompatible method override

When a class method marked with @override has a different parameter signature or return type than the corresponding method in a same-module base class, Basilisk reports an incompatible override.

The check compares annotation text extracted from the source for non-self parameters and the return type. The self/cls parameter is always skipped since its type naturally differs between base and child class.

class Base:
    def process(self: Base, data: str) -> str: ...

class Child(Base):
    @override
    def process(self: Child, data: int) -> int: ...  # E0016

How to handle it

Every rule is on by default — strict is the default, not a cage. You can dial classes_override down per-file or per-path from your editor or pyproject.toml, or fix the code so it type-checks. See the Type System rules and the complete diagnostic reference.

Canonical URL: https://www.basilisk-python.dev/errors/classes_override