Is the supplied server certificate EV?

def is_extended_validation(self, certificate: Certificate) -> bool:
        """Is the supplied server certificate EV?
        """
        if not self.ev_oids:
            raise ValueError('No EV OIDs supplied for {} store - cannot detect EV certificates'.format(self.name))

        try:
            cert_policies_ext = certificate.extensions.get_extension_for_oid(ExtensionOID.CERTIFICATE_POLICIES)
        except ExtensionNotFound:
            return False

        for policy in cert_policies_ext.value:
            if policy.policy_identifier in self.ev_oids:
                return True
        return False