Yaml Config System Python

import yaml

class Config:

    _file_name = None

    _content = {}
    _default = {}

    def __init__(self, file_name:str='config.yml'):
        self._file_name = file_name

    def load(self):
        with open(self._file_name, 'a+', encoding='utf8') as config_file:
            self._content = yaml.load(config_file)
            if self._content is None:
                self._content = {}

    def set_default(self, key:str, value):
        parse = self._parse_content_and_key(key, obj=self._default)
        parse[0][parse[1]] = value

    def set_defaults(self, defaults):
        for key in defaults:
            self.set_default(key, defaults[key])

    def copy_defaults(self):
        for key in self._default:
            if key not in self._content:
                self._content[key] = self._default[key]

    def save(self):
        with open(self._file_name, 'w+', encoding='utf8') as config_file:
            yaml.dump(self._content, config_file, default_flow_style=False)

    def get(self, key, default=None):
        parse = self._parse_content_and_key(key)
        return parse[0].get(parse[1], default)

    def _parse_content_and_key(self, key, obj=None):

        obj = self._content if obj is None else obj
        final_key = None

        split = key.split('.')
        for i in range(0, len(split)):
            if i + 1 == len(split):
                final_key = split[i]
                break

            if split[i] not in obj:
                obj[split[i]] = {}

            obj = obj[split[i]]

        return obj, final_key


CONFIG = Config()