Deserialize an ISO8601-formatted time to a :class:`datetime.time` object.

def _deserialize(self, value, attr, data, **kwargs):
        """Deserialize an ISO8601-formatted time to a :class:`datetime.time` object."""
        if not value:  # falsy values are invalid
            self.fail('invalid')
        try:
            return utils.from_iso_time(value)
        except (AttributeError, TypeError, ValueError):
            self.fail('invalid')