更改已设置的日志记录的"basicConfig" [英] Changing logging's 'basicConfig' which is already set

问题描述

我在python中使用日志记录模块为:

I am using the logging module in python as:

import logging, sys
logger= logging.getLogger(__file__)
logging.basicConfig(stream = sys.stderr, level=logging.DEBUG, format='%(filename)s:%(lineno)s %(levelname)s:%(message)s')
logger.debug("Hello World")

现在，在line 3上设置基本配置后，我想要一个命令行参数，该参数可以将输出流从sys.stderr更改为文件.

Now, after I have set the basic configuration on line 3, I want to have a command line argument that can change the output stream from sys.stderr to a file.

我已经阅读了文档，并说如果同时出现filename和stream，则会忽略stream.

I have read the doc and it says that if both filename and stream are present at the same time, the stream is ignored.

现在，我想知道在完成line 3中的basicConfig事情后如何将流更改为文件吗?

Now, I wanna know how do change the stream to a file after I have already done the basicConfig thing in line 3?

推荐答案

如果在logging/__init__.py的Python源代码中查找，您会看到basicConfig()通过调用addHandler()在根记录器对象上设置处理程序. .如果您想从头开始，则可以删除所有现有的处理程序，然后再次调用basicConfig().

If you look in the Python sources for logging/__init__.py, you'll see that basicConfig() sets the handlers on the root logger object by calling addHandler(). If you want to start from scratch, you could remove all existing handlers and then call basicConfig() again.

# Example to remove all root logger handlers and reconfigure. (UNTESTED)
import logging

# Remove all handlers associated with the root logger object.
for handler in logging.root.handlers[:]:
    logging.root.removeHandler(handler)

# Reconfigure logging again, this time with a file.
logging.basicConfig(filename = 'myfile.log', level=logging.DEBUG, format='%(filename)s:%(lineno)s %(levelname)s:%(message)s')

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