Class _NotValidator

src/attr/validators.py:635–668

@attrs(repr=False, slots=True, unsafe_hash=True)
class _NotValidator:
    validator = attrib()
    msg = attrib(
        converter=default_if_none(
            class="st">"not_ validator child &class="cm">#x27;{validator!r}' "
            class="st">"did not raise a captured error"
        )
    )
    exc_types = attrib(
        validator=deep_iterable(
            member_validator=_subclass_of(Exception),
            iterable_validator=instance_of(tuple),
        ),
    )

    def __call__(self, inst, attr, value):
        try:
            self.validator(inst, attr, value)
        except self.exc_types:
            pass  class="cm"># suppress error to invert validity
        else:
            raise ValueError(
                self.msg.format(
                    validator=self.validator,
                    exc_types=self.exc_types,
                ),
                attr,
                self.validator,
                value,
                self.exc_types,
            )

    def __repr__(self):
        return fclass="st">"<not_ validator wrapping {self.validator!r}, capturing {self.exc_types!r}>"


def not_(validator, *, msg=None, exc_types=(ValueError, TypeError)):