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Logging

Fonctionnalités de journalisation pour Python.

Exemples simples

Afficher les logs dans le terminal

import logging

logger = logging.getLogger(__name__)


def main() -> int:
    logger.info("Hello World!")
    return 0


if __name__ == "__main__":
    # Log to sys.stderr:
    logging.basicConfig(
        level=logging.DEBUG,
        format="%(asctime)s :: %(name)s :: %(levelname)s :: %(message)s",
    )

    # Call main function:
    import sys

    sys.exit(main())

Enregistrer les logs dans un fichier

import logging

logger = logging.getLogger(__name__)


def main() -> int:
    logger.info("Hello World!")
    return 0


if __name__ == "__main__":
    # Log to file:
    logging.basicConfig(
        level=logging.DEBUG,
        filename="activity.log",
        encoding="utf_8",
        format="%(asctime)s :: %(name)s :: %(levelname)s :: %(message)s",
    )

    # Call main function:
    import sys

    sys.exit(main())

Combiner plusieurs gestionnaires de journalisation

Tip

Cet exemple utilise rich pour enrichir les messages d'erreur dans les logs.

import logging

logger = logging.getLogger(__name__)


def main() -> int:
    logger.info("Hello World!")
    return 0


if __name__ == "__main__":
    # Log to file:
    from logging import FileHandler, Formatter

    file_formatter = Formatter(
        "%(asctime)s :: %(name)s :: %(levelname)s :: %(message)s"
    )
    file_handler = FileHandler(
        filename="activity.log",
        encoding="utf_8",
    )
    file_handler.setFormatter(file_formatter)
    file_handler.setLevel(logging.DEBUG)

    # Log to sys.stderr with rich text:
    from rich.logging import RichHandler

    stream_formatter = Formatter("%(message)s")
    stream_handler = RichHandler(rich_tracebacks=True)
    stream_handler.setFormatter(stream_formatter)
    stream_handler.setLevel(logging.DEBUG)

    # Main logging configuration:
    logging.basicConfig(
        level=logging.NOTSET,
        handlers=[
            file_handler,
            stream_handler,
        ],
    )

    # Call main function:
    import sys

    sys.exit(main())

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