Python使用basicConfig方法登录到控制台和文件 [英] Python using basicConfig method to log to console and file

问题描述

我不知道为什么这个代码打印到屏幕，但不是文件？创建文件example1.log，但没有写入。

I don't know why this code prints to the screen, but not to the file? File "example1.log" is created, but nothing is written there.

#!/usr/bin/env python3
import logging

logging.basicConfig(level=logging.DEBUG,
                    format='%(asctime)s %(message)s',
                    handlers=[logging.FileHandler("example1.log"),
                              logging.StreamHandler()])
logging.debug('This message should go to the log file and to the console')
logging.info('So should this')
logging.warning('And this, too')

我通过创建一个日志对象a href =https://www.synthetos.com/logging-in-python-programs/>示例代码），但它一直告诉我为什么basicConfig（）方法失败？

I have "bypassed" this problem by creating a logging object (example code), but it keeps bugging me why basicConfig() approach failed?

PS。如果我改变basicConfig调用：

PS. If I change basicConfig call to:

logging.basicConfig(level=logging.DEBUG,
                    filename="example2.log",
                    format='%(asctime)s %(message)s',
                    handlers=[logging.StreamHandler()])

然后所有日志都在文件中，控制台中不显示任何内容

Then all logs are in the file and nothing is displayed in the console

推荐答案

我无法在Python 3.3上重现它。消息被写入屏幕和'example2.log'。在Python< 3.3它创建文件，但它是空的。

I can't reproduce it on Python 3.3. The messages are written both to the screen and the 'example2.log'. On Python <3.3 it creates the file but it is empty.

代码：

from logging_tree import printout  # pip install logging_tree
printout()

显示 FileHandler（）未附加到Python< 3.3的根记录器。

shows that FileHandler() is not attached to the root logger on Python <3.3.

a href =http://docs.python.org/dev/library/logging.html#logging.basicConfig> logging.basicConfig（） 说在Python 3.3中添加句柄参数。 处理程序参数在Python 3.2文档中未提及。

The docs for logging.basicConfig() say that handlers argument is added in Python 3.3. The handlers argument isn't mentioned in Python 3.2 documentation.

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