我正在使用两个日志处理程序。一个用于DEBUG级别以上的文件，另一个用于WARNING及以上的控制台。
我正在使用许多模块，其中一些是外部的（使用pip安装）。当呼叫var moves = 0;
var movesToMakeForDeletionOfStar = [16, 24, 32];
$('#moveCounter').click(function () {
moves++;
$('#moves').text('moves ' + moves);
if($.inArray(moves, movesToMakeForDeletionOfStar) > -1) {
$('.stars').children().last().remove();
} else {
return;
}
});
（而不是logging.info()）时，这会破坏控制台记录器的设置：
logger.info()demo_module.py是：
import logging
import logging.handlers
import sys, os
from demo_module import something, something_else
logger = logging.getLogger("demo")
logger.setLevel(logging.DEBUG)
main_handler = logging.FileHandler('demo.log')
formatter = logging.Formatter('%(asctime)s %(name)s %(levelname)-8s %(filename)s:%(lineno)d %(message)s')
main_handler.setFormatter(formatter)
logger.addHandler(main_handler)
# log serious issues to console
console_handler = logging.StreamHandler(stream=sys.stderr)
console_handler.setLevel(logging.WARNING)
console_handler.setFormatter(formatter)
logger.addHandler(console_handler)
logger.debug('this is a debug')
logger.info('this is an info')
logger.warning('this is a warning')
logger.error('this is an error')
logger.critical('reactor has melted down')
something()
logger.info('after something')
something_else()
logger.info('after something else')
正如您所见，在import logging
logger = logging.getLogger('demo')
def something():
logger.info('something needs to be done')
a = 1+1
logger.info('something has been done')
logger.error('some banale error')
def something_else():
logger.info('calling logger.info')
# OOPS, calling logging instead of logger here
logging.info("module may use logging directly instead of logger")
logger.info('logger.info called')
内，有demo_module.something_else()而不是logging.info的电话。
控制台的输出如下所示：
logger.info如您所见，最后两行丢失了我最初设置为控制台处理程序的所有设置，如级别和格式化程序。
如果它只是我的代码，我可以找到这个有问题的% python logger.py
2017-10-07 17:45:08,077 demo WARNING logger2.py:21 this is a warning
2017-10-07 17:45:08,077 demo ERROR logger2.py:22 this is an error
2017-10-07 17:45:08,077 demo CRITICAL logger2.py:23 reactor has melted down
2017-10-07 17:45:08,078 demo ERROR demo_module.py:8 some banale error
INFO:demo:logger.info called
INFO:demo:after something else
语句并替换它，但是有些代码不是我的，而是第三方，因此我无法控制。
知道如何制作这些设置吗？
答案 0 :(得分：1)
默认情况下，模块级别日志记录功能将调用logging.basicConfig()来尝试配置根记录器。 Docs：
...模块级便捷函数，委托给根记录器，调用basicConfig（）以确保至少有一个处理程序可用。
logging.basicConfig＆＃39; docs州：
如果根记录器已经为其配置了处理程序，则此函数不执行任何操作。
因此解决方案是在调用任何模块级日志函数之前在根记录器上配置处理程序，同时还指示您的记录器不要在记录器层次结构中传播消息，以避免重复输出
import logging
import logging.handlers
import sys, os
from demo import something, something_else
formatter = logging.Formatter('%(asctime)s %(name)s %(levelname)-8s %(filename)s:%(lineno)d %(message)s')
# Configure the root logger.
root_logger = logging.getLogger()
root_logger.setLevel(logging.DEBUG)
# Configure file handler.
root_main_handler = logging.FileHandler('demo.log')
root_main_handler.setFormatter(formatter)
root_logger.addHandler(root_main_handler)
# Configure console handler.
root_console_handler = logging.StreamHandler(stream=sys.stderr)
root_console_handler.setLevel(logging.WARNING)
root_console_handler.setFormatter(formatter)
root_logger.addHandler(root_console_handler)
logger = logging.getLogger("demo")
logger.setLevel(logging.DEBUG)
main_handler = logging.FileHandler('demo.log')
main_handler.setFormatter(formatter)
logger.addHandler(main_handler)
# log serious issues to console
console_handler = logging.StreamHandler(stream=sys.stderr)
console_handler.setLevel(logging.WARNING)
console_handler.setFormatter(formatter)
logger.addHandler(console_handler)
# Don't propagate messages up to the root logger.
logger.propagate = False
logger.debug('this is a debug')
logger.info('this is an info')
logger.warning('this is a warning')
logger.error('this is an error')
logger.critical('reactor has melted down')
something()
logger.info('after something')
something_else()
logger.info('after something else')
控制台输出：
2017-10-07 18:46:50,644 demo WARNING run.py:35 this is a warning
2017-10-07 18:46:50,644 demo ERROR run.py:36 this is an error
2017-10-07 18:46:50,644 demo CRITICAL run.py:37 reactor has melted down
2017-10-07 18:46:50,645 demo ERROR demo.py:8 some banale error
文件输出：
2017-10-07 18:46:50,644 demo DEBUG run.py:33 this is a debug
2017-10-07 18:46:50,644 demo INFO run.py:34 this is an info
2017-10-07 18:46:50,644 demo WARNING run.py:35 this is a warning
2017-10-07 18:46:50,644 demo ERROR run.py:36 this is an error
2017-10-07 18:46:50,644 demo CRITICAL run.py:37 reactor has melted down
2017-10-07 18:46:50,645 demo INFO demo.py:5 something needs to be done
2017-10-07 18:46:50,645 demo INFO demo.py:7 something has been done
2017-10-07 18:46:50,645 demo ERROR demo.py:8 some banale error
2017-10-07 18:46:50,645 demo INFO run.py:39 after something
2017-10-07 18:46:50,645 demo INFO demo.py:11 calling logger.info
2017-10-07 18:46:50,645 root INFO demo.py:13 module may use logging directly instead of logger
2017-10-07 18:46:50,645 demo INFO demo.py:14 logger.info called
2017-10-07 18:46:50,645 demo INFO run.py:41 after something else