| """Grab the global logger instance.""" | |
| # Copyright (c) IPython Development Team. | |
| # Distributed under the terms of the Modified BSD License. | |
| from __future__ import annotations | |
| import logging | |
| from typing import Any | |
| _logger: logging.Logger | logging.LoggerAdapter[Any] | None = None | |
| def get_logger() -> logging.Logger | logging.LoggerAdapter[Any]: | |
| """Grab the global logger instance. | |
| If a global Application is instantiated, grab its logger. | |
| Otherwise, grab the root logger. | |
| """ | |
| global _logger # noqa: PLW0603 | |
| if _logger is None: | |
| from .config import Application | |
| if Application.initialized(): | |
| _logger = Application.instance().log | |
| else: | |
| _logger = logging.getLogger("traitlets") | |
| # Add a NullHandler to silence warnings about not being | |
| # initialized, per best practice for libraries. | |
| _logger.addHandler(logging.NullHandler()) | |
| return _logger | |