How to use certbot-dns-linode - 3 common examples

def __init__(self, api_key, api_version):
        super(_LinodeLexiconClient, self).__init__()

        self.api_version = api_version

        if api_version == 3:
            config = dns_common_lexicon.build_lexicon_config('linode', {}, {
                'auth_token': api_key,
            })

            self.provider = linode.Provider(config)
        elif api_version == 4:
            config = dns_common_lexicon.build_lexicon_config('linode4', {}, {
                'auth_token': api_key,
            })

            self.provider = linode4.Provider(config)
        else:

api_version = self.credentials.conf('version')
        if api_version == '':
            api_version = None

        if not api_version:
            api_version = 3

            # Match for v4 api key
            regex_v4 = re.compile('^[0-9a-f]{64}$')
            regex_match = regex_v4.match(api_key)
            if regex_match:
                api_version = 4
        else:
            api_version = int(api_version)

        return _LinodeLexiconClient(api_key, api_version)

def __init__(self, *args, **kwargs):
        super(Authenticator, self).__init__(*args, **kwargs)
        self.credentials = None