config.py 文件源码

def get(self, section, option, fallback=_UNSET):
        try:
            env = self.env_var_name(section, option)
            return os.environ[env] if env in os.environ else self.config_parser.get(section, option)
        except (configparser.NoSectionError, configparser.NoOptionError):
            if fallback is _UNSET:
                raise
            else:
                return fallback