Python 日志记录删除/检查/修改由 fileConfig() 配置的处理程序
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原文地址: http://stackoverflow.com/questions/3630774/
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logging remove / inspect / modify handlers configured by fileConfig()
提问by Pawel Furmaniak
How can I remove / inspect / modify handlers configured for my loggers using the fileConfig() function?
如何使用 fileConfig() 函数删除/检查/修改为我的记录器配置的处理程序？
For removing there is Logger.removeHandler(hdlr) method, but how do I get the handler in first place if it was configured from file?
对于删除有 Logger.removeHandler(hdlr) 方法，但是如果它是从文件配置的，我如何首先获取处理程序？
采纳答案by leoluk
logger.handlerscontains a list with all handlers of a logger.
logger.handlers包含一个包含所有记录器处理程序的列表。
回答by perlyking
Another approach might be to use a JSON or YAML config file which gets loaded into a dictionary which you can then view/manipulate before it's passed to the logger.config.
另一种方法可能是使用加载到字典中的 JSON 或 YAML 配置文件，然后您可以在将其传递给 logger.config 之前查看/操作该文件。
import yaml
import logging.config
with open (LOG_CONFIG, 'rt') as f:
config=yaml.safe_load(f)
config['handlers']['error_file_handler']['filename']='foo'
logging.config.dictConfig(config)
回答by Mickey Perlstein
This code will print all the loggers and for each logger its handlers
此代码将打印所有记录器以及每个记录器的处理程序
for k,v in logging.Logger.manager.loggerDict.items() :
print('+ [%s] {%s} ' % (str.ljust( k, 20) , str(v.__class__)[8:-2]) )
if not isinstance(v, logging.PlaceHolder):
for h in v.handlers:
print(' +++',str(h.__class__)[8:-2] )
This will print out the loggers and handlers in your system including their states and levels.
这将打印出系统中的记录器和处理程序，包括它们的状态和级别。
This will help you debug your logging issues
这将帮助您调试日志记录问题
output:
+ [root ] {logging.RootLogger} {DEBUG}
-------------------------
-name=root
-handlers=[<logging.FileHandler object at 0x7fc599585390>, <logging.StreamHandler object at 0x7fc599585550>]
-filters=[]
-propagate=True
-level=10
-disabled=False
-parent=None
+++logging.FileHandler {NOTSET}
-stream=<_io.TextIOWrapper name='/dev/logs/myapp.log' mode='w' encoding='UTF-8'>
-mode=w
-filters=[]
-encoding=None
-baseFilename=/home/dev/logs/myapp.log
-level=0
-lock=<unlocked _thread.RLock object owner=0 count=0 at 0x7fc5a85a4240>
-delay=False
-_name=None
-formatter=<logging.Formatter object at 0x7fc599585358>
+++logging.StreamHandler {DEBUG}
-lock=<unlocked _thread.RLock object owner=0 count=0 at 0x7fc5a85a4210>
-filters=[]
-stream=<ipykernel.iostream.OutStream object at 0x7fc5aa6abb00>
-level=10
-_name=None
-formatter=<logging.Formatter object at 0x7fc5995853c8>
+ [PathFinder ] {logging.Logger} {NOTSET}
-------------------------
-name=PathFinder
-handlers=[]
-filters=[]
-manager=<logging.Manager object at 0x7fc5b09757f0>
-propagate=True
-level=0
-disabled=False
-parent=<logging.RootLogger object at 0x7fc5b09757b8>
回答by Alias_Knagg
The answer by @Mickey-Perlstein was just what I was looking for, but the listing appears to come from a much more complete version than the code provided.
This code is kind of even cruder, but crucially for my use and understanding, includes the root logger
@Mickey-Perlstein 的答案正是我要找的，但清单似乎来自比提供的代码更完整的版本。
这段代码更粗略，但对我的使用和理解至关重要，包括根记录器
import logging
def listloggers():
rootlogger = logging.getLogger()
print(rootlogger)
for h in rootlogger.handlers:
print(' %s' % h)
for nm, lgr in logging.Logger.manager.loggerDict.items():
print('+ [%-20s] %s ' % (nm, lgr))
if not isinstance(lgr, logging.PlaceHolder):
for h in lgr.handlers:
print(' %s' % h)
output:
输出：
<RootLogger root (DEBUG)>
<TimedRotatingFileHandler /path/to/myapp.log (DEBUG)>
<StreamHandler <stdout> (DEBUG)>
+ [concurrent.futures ] <Logger concurrent.futures (DEBUG)>
+ [concurrent ] <logging.PlaceHolder object at 0x7f72f624eba8>
+ [asyncio ] <Logger asyncio (DEBUG)>
+ [myapp ] <Logger myapp (DEBUG)>
+ [flask.app ] <Logger flask.app (DEBUG)>
+ [flask ] <Logger flask (DEBUG)>
+ [werkzeug ] <Logger werkzeug (ERROR)>
