How to use the blackduck.HubRestApi.UnknownVersion function in blackduck

if kwargs.get('write_config_flag', True):
                self.write_config()
        except Exception:
            self.read_config()
            
        if self.config['insecure']:
            requests.packages.urllib3.disable_warnings()
        
        if self.config['debug']:
            print(self.configfile)
        
        self.token, self.csrf_token, self.cookie = self.get_auth_token()
        try:
            self.version_info = self._get_hub_rest_api_version_info()
        except UnknownVersion:
            self.version_info = {'version': '3'} # assume it's v3 since all versions after 3 supported version info

        self.bd_major_version = self._get_major_version()

def _get_hub_rest_api_version_info(self):
        '''Get the version info from the server, if available
        '''
        session = requests.session()
        url = self.config['baseurl'] + "/api/current-version"
        response = session.get(url, verify = not self.config['insecure'])

        if response.status_code == 200:
            version_info = response.json()
            if 'version' in version_info:
                return version_info
            else:
                raise UnknownVersion("Did not find the 'version' key in the response to a successful GET on /api/current-version")
        else:
            raise UnknownVersion("Failed to retrieve the version info from {}, status code {}".format(url, response.status_code))

def _get_hub_rest_api_version_info(self):
        '''Get the version info from the server, if available
        '''
        session = requests.session()
        url = self.config['baseurl'] + "/api/current-version"
        response = session.get(url, verify = not self.config['insecure'])

        if response.status_code == 200:
            version_info = response.json()
            if 'version' in version_info:
                return version_info
            else:
                raise UnknownVersion("Did not find the 'version' key in the response to a successful GET on /api/current-version")
        else:
            raise UnknownVersion("Failed to retrieve the version info from {}, status code {}".format(url, response.status_code))

def _get_hub_rest_api_version_info(self):
        '''Get the version info from the server, if available
        '''
        session = requests.session()
        url = self.config['baseurl'] + "/api/current-version"
        response = session.get(url, verify = not self.config['insecure'])

        if response.status_code == 200:
            version_info = response.json()
            if 'version' in version_info:
                return version_info
            else:
                raise UnknownVersion("Did not find the 'version' key in the response to a successful GET on /api/current-version")
        else:
            raise UnknownVersion("Failed to retrieve the version info from {}, status code {}".format(url, response.status_code))

def _get_hub_rest_api_version_info(self):
        '''Get the version info from the server, if available
        '''
        session = requests.session()
        url = self.config['baseurl'] + "/api/current-version"
        response = session.get(url, verify = not self.config['insecure'])

        if response.status_code == 200:
            version_info = response.json()
            if 'version' in version_info:
                return version_info
            else:
                raise UnknownVersion("Did not find the 'version' key in the response to a successful GET on /api/current-version")
        else:
            raise UnknownVersion("Failed to retrieve the version info from {}, status code {}".format(url, response.status_code))