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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Logging anti-patterns","articleBody":"1. Using `print` instead of `loging`\r\n2. Using root logger by `logging.info` or `logging.getLogger()` instead of `logging.getLogger(__name__)`\r\n3. Configuring a logger on import\r\nE.g.\r\n```\r\nimport logging\r\nlogger = logging.getLogger(__name__)\r\nlogger.addHandler(logging.StreamHandler(sys.stdout))\r\n\r\nif __name__ == '__main__':\r\n    main()\r\n```\r\nThis often happens after replacing `print` with `logging`\r\n4. Using `logging.getLogger(__file__)` instead of `logging.getLogger(__name__)`\r\n5. Sharing a logger across multiple files\r\nE.g.\r\n```\r\n# foo.py\r\nLOGGER = logging.getLogger(__name__)\r\n\r\n# bar.py\r\nfrom foo import LOGGER\r\n```\r\n6. Unnecessary calculations of logging arguments\r\n```\r\n# Bad\r\nlogger.debug('Message with %s', expensive_func())\r\n\r\n# Good\r\nif logger.isEnabledFor(logging.DEBUG):\r\n    logger.debug('Message with %s', expensive_func())\r\n```\r\nDocs: https://docs.python.org/3/howto/logging.html#optimization\r\n7. Not using built-in string formatting features\r\n```\r\n# Bad\r\nlogger.info('Some data: %s', repr(data))\r\n\r\n# Good\r\nlogger.info('Some data: %r', data)\r\n```","author":{"url":"https://github.com/amorgun","@type":"Person","name":"amorgun"},"datePublished":"2019-07-25T11:04:17.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/129/python-anti-patterns/issues/129"}