How to use the gitlabform.configuration.core.ConfigurationCore function in gitlabform

def __init__(self, config_path=None):
        configuration = ConfigurationCore(config_path)
        self.url = configuration.get("gitlab|url", environ.get("GITLAB_URL"))
        self.token = configuration.get("gitlab|token", environ.get("GITLAB_TOKEN"))
        self.ssl_verify = configuration.get("gitlab|ssl_verify", True)

        self.session = requests.Session()

        retries = Retry(total=3,
                        backoff_factor=0.25,
                        status_forcelist=[500, 502, 503, 504])

        self.session.mount('http://', HTTPAdapter(max_retries=retries))
        self.session.mount('https://', HTTPAdapter(max_retries=retries))
        self.session.verify = self.ssl_verify

        try:
            version = self._make_requests_to_api("version")

import logging

from gitlabform.configuration.core import ConfigurationCore, KeyNotFoundException

logger = logging.getLogger(__name__)


class ConfigurationProjectsAndGroups(ConfigurationCore):

    def get_projects(self) -> list:
        """
        :return: sorted list of projects with configs
        """
        try:
            return sorted(self.get("project_settings", {}).keys())
        except KeyNotFoundException:
            raise ConfigNotFoundException

    def get_effective_config_for_project(self, group_and_project) -> dict:
        """
        :param group_and_project: "project_group/project_name"
        :return: merged configuration for this project, from common, group/subgroup and project level.
                 If project belongs to a subgroup, like "x/y/z", then it gets config from both group "x" as well
                 as subgroup "y".