import logging from traitlets.config import Application class _ExtensionLogger: _LOGGER = None # type: Optional[logging.Logger] @classmethod def get_logger(cls) -> logging.Logger: if cls._LOGGER is None: app = Application.instance() cls._LOGGER = logging.getLogger("{!s}.jupyterlab_git".format(app.log.name)) return cls._LOGGER get_logger = _ExtensionLogger.get_logger