使用 python 日志记录模块设置日志记录级别的两种不同方法之间的区别

Question

What is the difference between the following 2 ways to set the log levels and is there a certain use case for either?以下两种设置日志级别的方法有什么区别，是否有特定用例？

logger.setLevel(logging.DEBUG)

logging.basicConfig(level=logging.DEBUG)

I ask this question because I used one rather than the other and it lead to this weird repeat logging output:我问这个问题是因为我使用了一个而不是另一个，它导致了这个奇怪的重复日志输出：

(envCSSS) csss@csss-website:~/csss-site-in-dev/csss-site/src$ python3.7 manage.py getmail
2020-01-14 18:24:56 = INFO - [settings.py] BASE_DIR set to /home/csss
2020-01-14 18:24:56 = INFO - [settings.py] DEBUG set to True
2020-01-14 18:24:56 = INFO - [settings.py] ROOT_DIR set to /home/csss/csss-site-in-dev
2020-01-14 18:24:56 = INFO - [settings.py] STATIC_URL set to /STATIC_URL/
2020-01-14 18:24:56 = INFO - [settings.py] STATIC_ROOT set to /home/csss/static_root/
2020-01-14 18:24:56 = INFO - [settings.py] MEDIA_URL set to /MEDIA_URL/
2020-01-14 18:24:56 = INFO - [settings.py] MEDIA_ROOT set to /home/csss/media_root/
2020-01-14 18:24:56 = INFO - [settings.py] FILE_FORM_MASTER_DIR set to form_uploads/form_uploads/
2020-01-14 18:24:56 = INFO - [settings.py] FILE_FORM_UPLOAD_DIR set to form_uploads/form_uploads/temporary_files/
2020-01-14 18:24:56 = INFO - [settings.py] DJANGO_MAILBOX_ATTACHMENT_UPLOAD_TO set to mailbox_attachments/%Y/%m/%d/
2020-01-14 10:24:57 = WARNING - INFO:django_mailbox.management.commands.getmail:Gathering messages for csss gmail
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:INFO:django_mailbox.management.commands.getmail:Gathering messages for csss gmail
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:INFO:django_mailbox.management.commands.getmail:Gathering messages for csss gmail
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:INFO:django_mailbox.management.commands.getmail:Gathering messages for csss gmail
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:INFO:django_mailbox.management.commands.getmail:Gathering messages for csss gmail
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:INFO:django_mailbox.management.commands.getmail:Gathering messages for csss gmail
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:INFO:django_mailbox.management.commands.getmail:Gathering messages for csss gmail
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:INFO:django_mailbox.management.commands.getmail:Gathering messages for csss gmail
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:INFO:django_mailbox.management.commands.getmail:Gathering messages for csss gmail
.....................
2020-01-14 10:24:57 = WARNING - Traceback (most recent call last):
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:Traceback (most recent call last):
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:Traceback (most recent call last):
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:Traceback (most recent call last):
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:Traceback (most recent call last):
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:Traceback (most recent call last):
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:Traceback (most recent call last):
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:Traceback (most recent call last):
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:Traceback (most recent call last):
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:Traceback (most recent call last):
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:Traceback (most recent call last):
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:Traceback (most recent call last):
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:Traceback (most recent call last):
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:Traceback (most recent call last):
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:Traceback (most recent call last):
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:Traceback (most recent call last):
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:Traceback (most recent call last):
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:Traceback (most recent call last):
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:Traceback (most recent call last):
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:Traceback (most recent call last):
2020-01-14 10:24:57 = WARNING - WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:WARNING:csss_site:Traceback (most recent call last):

setLevel cause the above issue and I had to swap it out for basicConfig to correct the logging issue. setLevel导致上述问题，我不得不将其换成basicConfig以纠正日志记录问题。

Answer 1

The documentation itself is self explanatory:文档本身是不言自明的：

logger.setLevel

Here, logger seems is an instance of a Logger .在这里， logger似乎是Logger一个实例。 By using setLevel you are setting the threshold level for this particular logger.通过使用setLevel您可以为此特定记录器设置阈值级别。

logging.basicConfig(level=logging.DEBUG)

Does basic configuration for the logging system by creating a StreamHandler with a default Formatter and adding it to the root logger.通过创建带有默认Formatter的StreamHandler并将其添加到根记录器，为日志记录系统进行基本配置。 The functions debug() , info() , warning() , error() and critical() will call basicConfig() automatically if no handlers are defined for the root logger.如果没有为根记录器定义处理程序，函数debug() 、 info() 、 warning() 、 error()和critical()将自动调用basicConfig() 。

Calling basicConfig will setup a logger with handler and formatter if a root logger is not already defined.如果尚未定义根记录器，则调用basicConfig将设置一个带有处理程序和格式化程序的记录器。 If you pass level here it will be set to the level of the root logger.如果在这里传递level ，它将被设置为根记录器的级别。

As you will notice that setLevel is available on a logger instance while basicConfig is available on the logging module.您会注意到setLevel在logger实例上可用，而basicConfig在logging模块上可用。

使用 python 日志记录模块设置日志记录级别的两种不同方法之间的区别

问题描述

1 个解决方案

解决方案1
1 已采纳 2020-03-11 04:46:37

使用 python 日志记录模块设置日志记录级别的两种不同方法之间的区别

问题描述

1 个解决方案

解决方案1 1 已采纳 2020-03-11 04:46:37

解决方案1
1 已采纳 2020-03-11 04:46:37