Method get_default_logging_config

traitlets/config/application.py:227–276

Return the base logging configuration. The default is to log to stderr using a StreamHandler, if no default handler already exists. The log handler level starts at logging.WARN, but this can be adjusted by setting the ``log_level`` attribute. The ``logging_

(self)

    ).tag(config=True)

    def get_default_logging_config(self) -> StrDict:
        """Return the base logging configuration.

        The default is to log to stderr using a StreamHandler, if no default
        handler already exists.

        The log handler level starts at logging.WARN, but this can be adjusted
        by setting the ``log_level`` attribute.

        The ``logging_config`` trait is merged into this allowing for finer
        control of logging.

        """
        config: StrDict = {
            "version": 1,
            "handlers": {
                "console": {
                    "class": "logging.StreamHandler",
                    "formatter": "console",
                    "level": logging.getLevelName(self.log_level),  # type:ignore[arg-type]
                    "stream": "ext://sys.stderr",
                },
            },
            "formatters": {
                "console": {
                    "class": (
                        f"{self._log_formatter_cls.__module__}"
                        f".{self._log_formatter_cls.__name__}"
                    ),
                    "format": self.log_format,
                    "datefmt": self.log_datefmt,
                },
            },
            "loggers": {
                self.__class__.__name__: {
                    "level": "DEBUG",
                    "handlers": ["console"],
                }
            },
            "disable_existing_loggers": False,
        }

        if IS_PYTHONW:
            # disable logging
            # (this should really go to a file, but file-logging is only
            # hooked up in parallel applications)
            del config["handlers"]
            del config["loggers"]

        return config

    @observe("log_datefmt", "log_format", "log_level", "logging_config")
    def _observe_logging_change(self, change: Bunch) -> None: