记录删除/检查/修改由fileConfig（）配置的处理程序

Question

如何使用fileConfig（）函数删除/检查/修改为记录器配置的处理程序？

要删除有Logger.removeHandler（hdlr）方法，但如果从文件配置处理程序，我如何首先获得处理程序？

Answer 1

logger.handlers包含一个包含记录器所有处理程序的列表。

Answer 2

另一种方法可能是使用JSON或YAML配置文件，该文件被加载到字典中，然后您可以在将其传递给logger.config之前进行查看/操作。

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)

Answer 3

此代码将打印所有记录器，并为每个记录器打印其处理程序

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] )

这将打印出系统中的记录器和处理程序，包括其状态和级别。

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>

Answer 4

@ Mickey-Perlstein的回答正是我想要的，但是清单似乎来自比提供的代码更完整的版本。
该代码甚至更粗糙，但对于我的使用和理解而言至关重要，其中包括根记录器

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)

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)> 

Answer 5

重新删除处理程序-如果有帮助的人想要删除我创建的所有日志（我正在学习python日志记录）的所有处理程序，并提出以下建议：

def log_close():
    # get all loggers
    loggers = [logging.getLogger(name) if 'your_app_name' in name else None for name in logging.root.manager.loggerDict]
    # for each valid logger remove all handlers
    for log in loggers:
        if log != None:
            while bool(len(log.handlers)):
                for handler in log.handlers:
                    log.removeHandler(handler)
# set up log
log = logging.getLogger('your_app_name')
log.setLevel('DEBUG')
log_format = '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
date_format = '%Y-%m-%d %H:%M:%S'
formatter = logging.Formatter(log_format, date_format)
log_filename = 'your_app_name.log'
log_write_mode = 'w+'
file_handler = logging.FileHandler(log_filename, log_write_mode)
file_handler.setFormatter(formatter)
log.addHandler(file_handler)
console_handler = logging.StreamHandler()
console_handler.setFormatter(formatter)
log.addHandler(console_handler)