Function is_init_only

mypy/semanal.py:8417–8421

(node: Var)

def is_init_only(node: Var) -> bool:
    return (
        isinstance(type := get_proper_type(node.type), Instance)
        and type.type.fullname == "dataclasses.InitVar"
    )


def erase_func_annotations(func: FuncDef) -> None: