Method element_error

traitlets/traitlets.py:4003–4010

(
        self, obj: t.Any, element: t.Any, validator: t.Any, side: str = "Values"
    )

        super().__init__(klass=dict, args=args, **kwargs)

    def element_error(
        self, obj: t.Any, element: t.Any, validator: t.Any, side: str = "Values"
    ) -> None:
        e = (
            side
            + f" of the '{self.name}' trait of {class_of(obj)} instance must be {validator.info()}, but a value of {repr_type(element)} was specified."
        )
        raise TraitError(e)

    def validate(self, obj: t.Any, value: t.Any) -> dict[K, V] | None:
        value = super().validate(obj, value)