How to use the pyreferrer.referrer.Referrer.rules function in pyreferrer

def parse(raw_url, custom_rules=None, user_agent=None):
        if raw_url is None and user_agent is None:
            return Referrer.BLANK_REFERRER
        raw_url = raw_url.strip().decode("utf-8").replace('\x00', '').encode("utf-8")
        rules = custom_rules or Referrer.rules
        url = urlparse(raw_url)
        domain_info = tldextract.extract(raw_url)
        user_agent_info = Referrer.extract_user_agent_info(user_agent)

        referrer = {
            'type': Referrer.Types.INDIRECT,
            'url': raw_url or user_agent_info['url'],
            'subdomain': domain_info.subdomain,
            'domain': domain_info.domain or user_agent_info['domain'],
            'label': domain_info.domain.title(),
            'tld': domain_info.suffix or user_agent_info['tld'],
            'path': url.path,
            'query': ''
        }

        if Referrer.is_valid_url(url, domain_info):

def parse(raw_url, custom_rules=None, user_agent=None):
        if raw_url is None and user_agent is None:
            return Referrer.BLANK_REFERRER
        raw_url = raw_url.strip()
        rules = custom_rules or Referrer.rules
        url = urlparse(raw_url)
        domain_info = tldextract.extract(raw_url)
        user_agent_info = Referrer.extract_user_agent_info(user_agent)

        referrer = {
            'type': Referrer.Types.INDIRECT,
            'url': raw_url or user_agent_info['url'],
            'subdomain': domain_info.subdomain,
            'domain': domain_info.domain or user_agent_info['domain'],
            'label': domain_info.domain.title(),
            'tld': domain_info.suffix or user_agent_info['tld'],
            'path': url.path,
            'query': ''
        }

        if Referrer.is_valid_url(url, domain_info):