Question

在我写的python脚本中，我正在尝试使用日志记录模块记录事件。我有以下代码来配置我的记录器：

ERROR_FORMAT = "%(levelname)s at %(asctime)s in %(funcName)s in %(filename) at line %(lineno)d: %(message)s"
DEBUG_FORMAT = "%(lineno)d in %(filename)s at %(asctime)s: %(message)s"
LOG_CONFIG = {'version':1,
              'formatters':{'error':{'format':ERROR_FORMAT},
                            'debug':{'format':DEBUG_FORMAT}},
              'handlers':{'console':{'class':'logging.StreamHandler',
                                     'formatter':'debug',
                                     'level':logging.DEBUG},
                          'file':{'class':'logging.FileHandler',
                                  'filename':'/usr/local/logs/DatabaseUpdate.log',
                                  'formatter':'error',
                                  'level':logging.ERROR}},
              'root':{'handlers':('console', 'file')}}
logging.config.dictConfig(LOG_CONFIG)

当我尝试运行logging.debug("Some string")时，我没有输出到控制台，即使this page in the docs说logging.debug应该让根记录器输出消息。为什么我的程序没有输出任何内容，我该如何解决？

Answer 1

默认日志记录级别为警告。由于您没有更改级别，因此根记录器的级别仍然是警告。这意味着它将忽略任何低于警告级别的日志记录，包括调试日志。

tutorial：

中对此进行了解释

import logging
logging.warning('Watch out!') # will print a message to the console
logging.info('I told you so') # will not print anything

'info'行不会打印任何内容，因为级别高于info。

要更改级别，只需在根记录器中设置它：

'root':{'handlers':('console', 'file'), 'level':'DEBUG'}

换句话说，仅使用level = DEBUG定义处理程序是不够的，实际的日志记录级别也必须是DEBUG才能使其输出任何内容。

Answer 2

也许试试看？看来在我的情况下删除了所有处理程序后，问题就解决了。

for handler in logging.root.handlers[:]:
    logging.root.removeHandler(handler)

logging.basicConfig(filename='output.log', level=logging.INFO)

Answer 3

很多年后，Python记录器似乎仍然存在可用性问题。以下是一些示例说明：

import logging
# This sets the root logger to write to stdout (your console)
logging.basicConfig()

# By default the root logger is set to WARNING and all loggers you define
# inherit that value. Here we set the root logger to NOTSET. This logging
# level is automatically inherited by all existing and new sub-loggers
# that do not set a less verbose level.
logging.root.setLevel(logging.NOTSET)

# The following line sets the root logger level as well:
logging.basicConfig(level=logging.NOTSET)


# You can either share the `logger` object between all your files or the
# handle `my-app`. The result is the same.
logger = logging.getLogger("my-app")

logger.info("this will get printed")

# In large applications where you would like more control over the logging,
# create sub-loggers from your main application logger.
component_logger = logger.getChild("component-a")
component_logger.info("this will get printed with the prefix `my-app.component-a`")

# If you wish to control the logging levels, you can set the level anywhere in the
# hierarchy:
#
# - root
#   - my-app
#     - component-a
#

# Example for development:
logger.setLevel(logging.DEBUG)

# If that prints too much, enable debug printing only for your component:
component_logger.setLevel(logging.DEBUG)


# For production you rather want:
logger.setLeve(logging.WARNING)

Answer 4

对于这里任何想要超级简单答案的人：只需设置要显示的级别即可。我在所有脚本的顶部都放了：

Select id From tablename

然后显示该级别或更高级别的任何内容：

Select * From tablename Where id = clickedvalue

这是层次结构的一组级别，因此日志将以您设置的级别或更高显示。因此，如果要显示错误，可以使用import logging logging.basicConfig(level = logging.INFO)。

级别为logging.info("Hi you just set your fleeb to level plumbus")，logging.error("The plumbus is broken")，DEBUG和INFO。默认设置为WARNING。

这是一篇很好的文章，包含的信息比我的回答要好：
https://www.digitalocean.com/community/tutorials/how-to-use-logging-in-python-3

Answer 5

import logging
log = logging.getLogger()
log.setLevel(logging.DEBUG)

此代码会将默认日志记录级别设置为 DEBUG。

Python日志记录不输出任何内容

5 个答案: