导入的模块添加了不必要的日志记录.如何抑制它? [英] Imported module adding unwanted logging. How can it be suppressed?
问题描述
在导入需要使用的模块后,我看到了额外的日志消息.我正在尝试找出正确的方法来阻止这种情况的发生.以下代码最能说明问题:
I'm seeing extra logging messages after I've imported a module I need to use. I'm trying to work out the correct way to stop this happening. The following code shows the issue best:
import os
import logging
import flickrapi
class someObject:
def __init__(self):
self.value = 1
logger = logging.getLogger(__name__)
print logger.handlers
logger.info("value = " + str(self.value))
def main():
# Set up logging
logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)
formatter = logging.Formatter('[%(asctime)-15s] %(name)-8s %(levelname)-6s %message)s')
fh = logging.FileHandler(os.path.splitext(os.path.basename(__file__))[0]+".log")
fh.setLevel(logging.DEBUG)
fh.setFormatter(formatter)
logger.addHandler(fh)
ch = logging.StreamHandler()
ch.setLevel(logging.INFO)
ch.setFormatter(formatter)
logger.addHandler(ch)
logger.debug("Debug message")
logger.info("Info message")
thingy = someObject()
if __name__ == "__main__":
main()
通过flickrapi导入,我看到以下输出:
With the flickrapi import I see the following output:
DEBUG:__main__:Debug message
[2013-05-03 12:10:47,755] __main__ INFO Info message
INFO:__main__:Info message
[<logging.FileHandler instance at 0x1676dd0>, <logging.StreamHandler instance at 0x1676ea8>]
[2013-05-03 12:10:47,755] __main__ INFO value = 1
INFO:__main__:value = 1
移除flickrapi导入后,我看到正确的输出:
With the flickrapi import removed I see the correct output:
[2013-05-03 12:10:47,755] __main__ INFO Info message
[<logging.FileHandler instance at 0x1676dd0>, <logging.StreamHandler instance at 0x1676ea8>]
[2013-05-03 12:10:47,755] __main__ INFO value = 1
这是我第一次使用日志记录,这让我有些困惑.我已经阅读了几次文档,但是我认为我的理解中缺少一些东西.
This is my first time of using logging and it's got me a little stumped. I've read the documentation a couple of times but I think I'm missing something in my understanding.
看logging.Logger.manager.loggerDict
,还有其他记录器,但它们的每个.handlers
都是空的. __main__
记录器仅具有我添加的两个处理程序,因此这些消息来自何处?
Looking at logging.Logger.manager.loggerDict
, there are other loggers but each of their .handlers
is empty. The __main__
logger only has the two handlers I've added so where do these messages come from?
关于我如何解决此问题的任何指示,在我碰壁时将不胜感激.
Any pointers as to how I can solve this would be much appreciated as I've hit a wall.
谢谢
推荐答案
这是您使用的flickrapi库中的错误.它在它是__init__.py
,这是错误的为库执行此操作,因为它向根记录器添加了默认为stderr的StreamHandler.
This is a bug in the flickrapi library you are using. It is calling logging.basicConfig() in it's __init__.py
which is the wrong thing to do for a library since it adds a StreamHandler defaulting to stderr to the root logger.
您可能应该与作者一起打开错误报告. 在python日志记录文档中有一个关于如何库应配置日志记录.
You should probably open a bug report with the author. There is a HOWTO in the python logging docs on how libraries should configure logging.
要在解决此问题之前解决此问题,您应该可以执行以下操作:
To work around this issue until the bug is fixed you should be able to do the following:
# at the top of your module before doing anything else
import flickrapi
import logging
try:
logging.root.handlers.pop()
except IndexError:
# once the bug is fixed in the library the handlers list will be empty - so we need to catch this error
pass
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