blocks|key|4713314|text|fileConfig是一种根据文件为您配置日志级别的机制；您可以随时在程序中动态更改日志级别。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4713315|在需要更改日志级别的日志对象上调用.setLevel()。通常，您会在根目录上执行此操作：|4713316|logging.getLogger().setLevel(logging.DEBUG)|code-block|syntax|javascript|4713317|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.python.org/2/library/logging.html#logging.Logger.setLevel^0|0|A|0|H|B|H|B|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@$9|10|A|11|1|12]]|E|$]]|$1|H|3|I|5|J|7|13|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

<code>fileConfig</code> is a mechanism to configure the log level for you based on a file; you can dynamically change it at any time in your program.

Call <a href="http://docs.python.org/2/library/logging.html#logging.Logger.setLevel" rel="noreferrer"><code>.setLevel()</code></a> on the logging object for which you want to change the log level. Usually you'd do that on the root:

<pre><code>logging.getLogger().setLevel(logging.DEBUG)
</code></pre>

blocks|key|4713617|text|除了公认的答案:根据您初始化记录器的方式，您可能还必须更新记录器的处理程序：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4713618|import+logging

level+=+logging.DEBUG
logger+=+logging.getLogger()
logger.setLevel(level)
for+handler+in+logger.handlers:
++++handler.setLevel(level)|code-block|syntax|javascript|4713619|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In addition to the accepted answer: Depending on how you initialized the logger, you might also have to update the logger's handlers:

<pre><code>import logging

level = logging.DEBUG
logger = logging.getLogger()
logger.setLevel(level)
for handler in logger.handlers:
 handler.setLevel(level)
</code></pre>

blocks|key|4713637|text|在sfinken's+answer和Starman的后续评论上展开，您还可以检查处理程序的类型，以针对特定的输出器-例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4713638|import+logging
logger+=+logging.getLogger()
for+handler+in+logger.handlers:
++++if+isinstance(handler,+type(logging.StreamHandler())):
++++++++handler.setLevel(logging.DEBUG)
++++++++logger.debug('Debug+logging+enabled')|code-block|syntax|javascript|4713639|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/46710435/11678073^0|1|G|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Expanding on <a href="https://stackoverflow.com/a/46710435/11678073">sfinken's answer</a>, and Starman's subsequent comment, you can also check the type of the handler to target a specific outputter - for instance:

<pre><code>import logging
logger = logging.getLogger()
for handler in logger.handlers:
 if isinstance(handler, type(logging.StreamHandler())):
 handler.setLevel(logging.DEBUG)
 logger.debug('Debug logging enabled')
</code></pre>

blocks|key|207331|text|这可能就是您要查找的内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|207332|import+logging
logging.getLogger().setLevel(logging.INFO)|code-block|syntax|javascript|207333|请注意，在不带任何参数的情况下调用getLogger()将返回根记录器。|offset|length|style|CODE|207334|entityMap^0|0|0|H|B|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

This might be what you are looking for:

<pre><code>import logging
logging.getLogger().setLevel(logging.INFO)
</code></pre>

Note that <code>getLogger()</code> called without any arguments returns the root logger.

blocks|key|207507|text|我最终决定使用inotify和gevent来检查文件写操作，一旦我知道文件已经被更改，我就会根据配置为每个记录器设置级别。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|207508|import+gevent
import+gevent_inotifyx+as+inotify
from+gevent.queue+import+Queue

class+FileChangeEventProducer(gevent.Greenlet):
++++def+__init__(self,+fd,+queue):
++++++++gevent.Greenlet.__init__(self)
++++++++self.fd+=+fd
++++++++self.queue+=+queue

++++def+_run(self):
++++++++while+True:
++++++++++++events+=+inotify.get_events(self.fd)
++++++++++++for+event+in+events:
++++++++++++++++self.queue.put(event)
++++++++++++++++gevent.sleep(0)


class+FileChangeEventConsumer(gevent.Greenlet):
++++def+__init__(self,+queue,+callBack):
++++++++gevent.Greenlet.__init__(self)
++++++++self.queue+=+queue
++++++++self.callback+=+callBack

++++def+_run(self):
++++++++while+True:
++++++++++++_+=+self.queue.get()
++++++++++++self.callback()
++++++++++++gevent.sleep(0)


class+GeventManagedFileChangeNotifier:
++++def+__init__(self,+fileLocation,+callBack):
++++++++self.fileLocation+=+fileLocation
++++++++self.callBack+=+callBack
++++++++self.queue+=+Queue()
++++++++self.fd+=+inotify.init()
++++++++self.wd+=+inotify.add_watch(self.fd,+self.fileLocation,+inotify.IN_CLOSE_WRITE)


++++def+start(self):
++++++++producer+=+FileChangeEventProducer(self.fd,+self.queue)
++++++++producer.start()
++++++++consumer+=+FileChangeEventConsumer(self.queue,+self.callBack)
++++++++consumer.start()
++++++++return+(producer,+consumer)|code-block|syntax|javascript|207509|上述代码的用法如下所示：|207510|++++def+_setUpLoggingConfigFileChangeNotifier(self):
++++++++loggingFileNameWithFullPath+=+self._getFullPathForLoggingConfig()
++++++++self.gFsNotifier+=+GeventManagedFileChangeNotifier(loggingFileNameWithFullPath,+self._onLogConfigChanged)
++++++++self.fsEventProducer,+self.fsEventConsumer+=+self.gFsNotifier.start()


++++def+_onLogConfigChanged(self):
++++++++self.rootLogger.info('Log+file+config+has+changed+-+examining+the+changes')
++++++++newLoggingConfig+=+Config(self.resourcesDirectory,+[self.loggingConfigFileName]).config.get('LOG')
++++++++self.logHandler.onLoggingConfigChanged(newLoggingConfig)|207511|一旦我有了新的日志文件config，我就可以为config中的每个记录器连接正确的日志记录级别。我只是想分享一下答案，如果有人想在gevent中使用它，它可能会对他们有所帮助。|207512|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I finally settled with using inotify and gevent to check for the file write operation, and once I know the file has been changed then I go and set the level for each logger I have based on the config.

<pre><code>import gevent
import gevent_inotifyx as inotify
from gevent.queue import Queue

class FileChangeEventProducer(gevent.Greenlet):
 def __init__(self, fd, queue):
 gevent.Greenlet.__init__(self)
 self.fd = fd
 self.queue = queue

 def _run(self):
 while True:
 events = inotify.get_events(self.fd)
 for event in events:
 self.queue.put(event)
 gevent.sleep(0)


class FileChangeEventConsumer(gevent.Greenlet):
 def __init__(self, queue, callBack):
 gevent.Greenlet.__init__(self)
 self.queue = queue
 self.callback = callBack

 def _run(self):
 while True:
 _ = self.queue.get()
 self.callback()
 gevent.sleep(0)


class GeventManagedFileChangeNotifier:
 def __init__(self, fileLocation, callBack):
 self.fileLocation = fileLocation
 self.callBack = callBack
 self.queue = Queue()
 self.fd = inotify.init()
 self.wd = inotify.add_watch(self.fd, self.fileLocation, inotify.IN_CLOSE_WRITE)


 def start(self):
 producer = FileChangeEventProducer(self.fd, self.queue)
 producer.start()
 consumer = FileChangeEventConsumer(self.queue, self.callBack)
 consumer.start()
 return (producer, consumer)
</code></pre>

The above code gets used like below,

<pre><code> def _setUpLoggingConfigFileChangeNotifier(self):
 loggingFileNameWithFullPath = self._getFullPathForLoggingConfig()
 self.gFsNotifier = GeventManagedFileChangeNotifier(loggingFileNameWithFullPath, self._onLogConfigChanged)
 self.fsEventProducer, self.fsEventConsumer = self.gFsNotifier.start()


 def _onLogConfigChanged(self):
 self.rootLogger.info('Log file config has changed - examining the changes')
 newLoggingConfig = Config(self.resourcesDirectory, [self.loggingConfigFileName]).config.get('LOG')
 self.logHandler.onLoggingConfigChanged(newLoggingConfig)
</code></pre>

Once I have the new log file config I can wire in the right logging level for each logger from config. I just wanted to share the answer and it might help someone if they are trying to use it with gevent.

blocks|key|4713467|text|根据您的应用程序，您首先需要找到一种方法，在执行过程中根据自己的配置文件重新加载该文件或重置日志级别。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4713468|最简单的方法是使用计时器。要么使用线程来实现这一点，要么让你的异步框架来实现这一点(如果你使用的话；他们通常会实现它)。|4713469|使用threading.Timer：|4713470|import+threading
import+time


def+reset_level():
++++#+you+can+reload+your+own+config+file+or+use+logging.config.fileConfig+here
++++print+'Something+else'
++++pass


t+=+threading.Timer(10,+reset_level)
t.start()

while+True:
++++#+your+app+code
++++print+'Test'
++++time.sleep(2)|code-block|syntax|javascript|4713471|输出：|4713472|Test
Test
Test
Test
Test
Something+else
Test
Test|4713473|更新:请检查Martijn提出的解决方案。|4713474|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|U|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|V|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

Depending on your app, you first need to find a way for reloading that file or resetting the log level based on your own config file during execution.

Easiest way would be to use a timer. Either use threading to do that, or make your async framework to do that (if you use any; they usually implement it).

Using threading.Timer:

<pre><code>import threading
import time


def reset_level():
 # you can reload your own config file or use logging.config.fileConfig here
 print 'Something else'
 pass


t = threading.Timer(10, reset_level)
t.start()

while True:
 # your app code
 print 'Test'
 time.sleep(2)
</code></pre>

Output:

<pre><code>Test
Test
Test
Test
Test
Something else
Test
Test
</code></pre>

Update: 
Please check the solution proposed by Martijn Pieters.

Is it possible to change the log level using fileConfig in python without restarting the application. If it cannot be achieved through fileConfig is there some other way to get the same result? 

Update: This was for an application running on a server, I wanted sys admins to be able to change a config file that would be picked during run time by application and change the log level dynamically. I was working with gevent at that time hence I've added my code as one of the answers which uses inotify to pick changes to config file.

Dynamically changing log level without restarting the application

日志文件

服务器

是否可以在不重新启动应用程序的情况下使用python中的fileConfig更改日志级别。如果不能通过fileConfig实现，是否有其他方法可以获得相同的结果？更新:这是针对在服务器上运行的应用程序，我希望sys管理员能够更改在运行时由应用程序选择的配置文件，并动态更改日志级别。我当时正在使用gevent，因此我添加了我的代码作为答案之一，它使用inotify来选择对配置文件的更改。

问无需重启应用程序即可动态更改日志级别
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