python - 如何使用 python 日志记录模块打印多行日志？

Question

我想使用 python 日志记录模块创建多行记录器。当我使用下面的代码片段来格式化记录器时:

import logging
logger = logging.getLogger(file_name)
logger.setLevel(logging.DEBUG)
ch = logging.StreamHandler()
ch.setLevel(logging.DEBUG)
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
ch.setFormatter(formatter)
logger.addHandler(ch)

当我使用 logger.info("""line 1\nline 2\n line 3""")时，我得到以下多行日志的输出p>

2017-07-20 13:21:14,754 - my_logger.py - INFO - line 1
line 2
line 3

我想要我的输出如下:

2017-07-20 13:21:14,754 - my_logger.py - INFO - line 1
2017-07-20 13:21:14,754 - my_logger.py - INFO - line 2
2017-07-20 13:21:14,754 - my_logger.py - INFO - line 3

Answer 1

您可以创建自己的格式化程序:

import logging
class MultilineFormatter(logging.Formatter):
    def format(self, record: logging.LogRecord):
        save_msg = record.msg
        output = ""
        for line in save_msg.splitlines():
            record.msg = line
            output += super().format(record) + "\n"
        record.msg = save_msg
        record.message = output
        return output

比修改你的记录器初始化如下:

formatter = MultilineFormatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')