首先，从结论
-
当disable_existing_loggers = True时，
- 记录器采用该设置，它是设置文件中设置的目标。
- 未包含在配置文件中的记录器将被禁用
-
当disable_existing_loggers = False时
- 设置文件中作为设置目标的记录器将采用该设置
- 根记录器的设置适用于不是设置文件中设置目标的记录器。
实验
设置要由logging_condig_dictConfig()设置的内容
- 没有特别的设定
- 仅个人记录器
- 仅根记录器
若要调查将
，
三种类型的disable_existing_loggers设置为True / False时的行为
- 初始状态
- 运行logging.config.dictConfig后立即
- 重新定义记录器之后
尝试在
的三个位置输出日志。
使用的脚本如下。
log_test.py
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | import logging.config import json import argparse def output_logs(logger): # loggerとloggingを出力 print("-"*20 + "logger"+ "-"*20) logger.debug("debug") logger.info("info") logger.warning("warning") logger.error("error") logger.critical("critical") print("-"*20 + "logging" + "-"*20) logging.debug("debug") logging.info("info") logging.warning("warning") logging.error("error") logging.critical("critical") def logging_condig_dictConfig(conf): if conf is not None: logconfig = json.load(open(conf, 'r')) logging.config.dictConfig(logconfig) print("="*50) print("logging.config.dictConfig():") print("disable_existing_loggers = {}".format(logconfig["disable_existing_loggers"])) print("="*50) def main(): parser = argparse.ArgumentParser() parser.add_argument("--log_config") args = parser.parse_args() logger = logging.getLogger('example') output_logs(logger) logging_condig_dictConfig(args.log_config) output_logs(logger) logger = logging.getLogger('example') output_logs(logger) if __name__ == "__main__": main() |
(未特别设置)
conf.json
1 2 3 4 | { "version": 1, "disable_existing_loggers": true/false } |
disable_existing_loggers = True
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | --------------------logger-------------------- # デフォルト warning error critical --------------------logging-------------------- # デフォルト WARNING:root:warning ERROR:root:error CRITICAL:root:critical ================================================== logging.config.dictConfig(): disable_existing_loggers = True ================================================== --------------------logger-------------------- # ロガーが無効になる --------------------logging-------------------- WARNING:root:warning ERROR:root:error CRITICAL:root:critical --------------------logger-------------------- # 再定義しても無効のまま --------------------logging-------------------- WARNING:root:warning ERROR:root:error CRITICAL:root:critical |
disable_existing_loggers = False
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | --------------------logger-------------------- # デフォルト warning error critical --------------------logging-------------------- # デフォルト WARNING:root:warning ERROR:root:error CRITICAL:root:critical ================================================== logging.config.dictConfig(): disable_existing_loggers = False ================================================== --------------------logger-------------------- # 無効にはならないが、ロガーの設定が変わっている(なぜ？) WARNING:example:warning ERROR:example:error CRITICAL:example:critical --------------------logging-------------------- WARNING:root:warning ERROR:root:error CRITICAL:root:critical --------------------logger-------------------- # 再定義しても変化しない WARNING:example:warning ERROR:example:error CRITICAL:example:critical --------------------logging-------------------- WARNING:root:warning ERROR:root:error CRITICAL:root:critical |
在两种情况下，根记录器的设置都不会更改，因此记录输出始终相同
为各个记录器提供设置
将设置添加到
conf.json
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | { "version": 1, "disable_existing_loggers": true/false, "formatters": { "simple": { "format": "[%(asctime)s][%(module)s:%(lineno)s][%(name)s][%(levelname)s] %(message)s" } }, "handlers": { "console": { "class": "logging.StreamHandler", "level": "DEBUG", "formatter": "simple", "stream": "ext://sys.stdout" }, "info_file_handler": { "class": "logging.handlers.RotatingFileHandler", "level": "DEBUG", "formatter": "simple", "filename": "log/test.log", "maxBytes": 10485760, "backupCount": 20, "encoding": "utf8" } }, "loggers": { "example": { "level": "ERROR", "handlers": ["console", "info_file_handler"] } } } |
disable_existing_loggers = True
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | --------------------logger-------------------- warning error critical --------------------logging-------------------- WARNING:root:warning ERROR:root:error CRITICAL:root:critical ================================================== logging.config.dictConfig(): disable_existing_loggers = True ================================================== --------------------logger-------------------- # 設定を付与すると、以前に生成したロガーであっても有効になる [2017-10-05 11:33:05,821][log_test:11][example][ERROR] error ERROR:example:error [2017-10-05 11:33:05,822][log_test:12][example][CRITICAL] critical CRITICAL:example:critical --------------------logging-------------------- WARNING:root:warning ERROR:root:error CRITICAL:root:critical --------------------logger-------------------- # 再定義しても変化なし [2017-10-05 11:33:05,823][log_test:11][example][ERROR] error ERROR:example:error [2017-10-05 11:33:05,823][log_test:12][example][CRITICAL] critical CRITICAL:example:critical --------------------logging-------------------- WARNING:root:warning ERROR:root:error CRITICAL:root:critical |
disable_existing_loggers = False
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | --------------------logger-------------------- warning error critical --------------------logging-------------------- WARNING:root:warning ERROR:root:error CRITICAL:root:critical ================================================== logging.config.dictConfig(): disable_existing_loggers = False ================================================== --------------------logger-------------------- # 設定した通りのログが出力 [2017-10-05 11:29:49,830][log_test:11][example][ERROR] error ERROR:example:error [2017-10-05 11:29:49,831][log_test:12][example][CRITICAL] critical CRITICAL:example:critical --------------------logging-------------------- WARNING:root:warning ERROR:root:error CRITICAL:root:critical --------------------logger-------------------- # 再定義しても変化しない [2017-10-05 11:29:49,832][log_test:11][example][ERROR] error ERROR:example:error [2017-10-05 11:29:49,832][log_test:12][example][CRITICAL] critical CRITICAL:example:critical --------------------logging-------------------- WARNING:root:warning ERROR:root:error CRITICAL:root:critical |
将设置提供给root logger
conf.json
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | { "version": 1, "disable_existing_loggers": true/false, "formatters": { "simple": { "format": "[%(asctime)s][%(module)s:%(lineno)s][%(name)s][%(levelname)s] %(message)s" } }, "handlers": { "console": { "class": "logging.StreamHandler", "level": "DEBUG", "formatter": "simple", "stream": "ext://sys.stdout" }, "info_file_handler": { "class": "logging.handlers.RotatingFileHandler", "level": "DEBUG", "formatter": "simple", "filename": "log/test.log", "maxBytes": 10485760, "backupCount": 20, "encoding": "utf8" } }, "root": { "level": "ERROR", "handlers": [ "console", "info_file_handler" ] } } |
disable_existing_loggers = True
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | --------------------logger-------------------- warning error critical --------------------logging-------------------- WARNING:root:warning ERROR:root:error CRITICAL:root:critical ================================================== logging.config.dictConfig(): disable_existing_loggers = True ================================================== --------------------logger-------------------- # ロガーは無効化される --------------------logging-------------------- # ルートロガーに設定が付与される [2017-10-05 11:41:21,581][log_test:18][root][ERROR] error [2017-10-05 11:41:21,582][log_test:19][root][CRITICAL] critical --------------------logger-------------------- # ロガーを再定義しても無効化されたまま --------------------logging-------------------- [2017-10-05 11:41:21,582][log_test:18][root][ERROR] error [2017-10-05 11:41:21,583][log_test:19][root][CRITICAL] critical |
disable_existing_loggers = False
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | --------------------logger-------------------- warning error critical --------------------logging-------------------- WARNING:root:warning ERROR:root:error CRITICAL:root:critical ================================================== logging.config.dictConfig(): disable_existing_loggers = False ================================================== --------------------logger-------------------- # ルートロガーの設定が付与される(なるほど) [2017-10-05 11:45:06,287][log_test:11][example][ERROR] error [2017-10-05 11:45:06,288][log_test:12][example][CRITICAL] critical --------------------logging-------------------- # ルートロガーの設定が付与される [2017-10-05 11:45:06,288][log_test:18][root][ERROR] error [2017-10-05 11:45:06,288][log_test:19][root][CRITICAL] critical --------------------logger-------------------- # 再定義しても変化なし [2017-10-05 11:45:06,288][log_test:11][example][ERROR] error [2017-10-05 11:45:06,289][log_test:12][example][CRITICAL] critical --------------------logging-------------------- [2017-10-05 11:45:06,289][log_test:18][root][ERROR] error [2017-10-05 11:45:06,289][log_test:19][root][CRITICAL] critical |