How to use the pydoctor.model.PrivacyClass.HIDDEN function in pydoctor

param obj: Object for which the privacy is reported.
        type obj: C{model.Documentable}

        rtype: C{model.PrivacyClass} member
        """
        if documentable.fullName() == 'twisted.test':
            # Match this package exactly, so that proto_helpers
            # below is visible
            return model.PrivacyClass.VISIBLE

        current = documentable
        while current:
            if current.fullName() == 'twisted.test.proto_helpers':
                return model.PrivacyClass.VISIBLE
            if isinstance(current, model.Package) and current.name == 'test':
                return model.PrivacyClass.HIDDEN
            current = current.parent

        return super(TwistedSystem, self).privacyClass(documentable)

type obj: C{model.Documentable}

        rtype: C{model.PrivacyClass} member
        """

        if documentable.fullName() == 'twisted.test':
            # Match this package exactly, so that proto_helpers
            # below is visible
            return model.PrivacyClass.VISIBLE

        current = documentable
        while current:
            if current.fullName() == 'twisted.test.proto_helpers':
                return model.PrivacyClass.VISIBLE
            if isinstance(current, model.Package) and current.name == 'test':
                return model.PrivacyClass.HIDDEN
            current = current.parent

        return super(TwistedSystem, self).privacyClass(documentable)