Method class_init

traitlets/traitlets.py:2446–2449

(self, cls: type[HasTraits], name: str | None)

        return default

    def class_init(self, cls: type[HasTraits], name: str | None) -> None:
        for trait_type in reversed(self.trait_types):
            trait_type.class_init(cls, None)
        super().class_init(cls, name)

    def subclass_init(self, cls: type[t.Any]) -> None:
        for trait_type in reversed(self.trait_types):