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How can I remove / inspect / modify handlers configured for my loggers using the fileConfig() function?
For removing there is Logger.removeHandler(hdlr) method, but how do I get the handler in first place if it was configured from file?
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The log handler is the component that effectively writes/displays a log: Display it in the console (via StreamHandler), in a file (via FileHandler), or even by sending you an email via SMTPHandler, etc. Each log handler has 2 important fields: A formatter which adds context information to a log.
getLogger(name) is typically executed. The getLogger() function accepts a single argument - the logger's name. It returns a reference to a logger instance with the specified name if provided, or root if not. Multiple calls to getLogger() with the same name will return a reference to the same logger object.
logger.handlers contains a list with all handlers of a logger.
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This code will print all the loggers and for each logger its handlers
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.
This will help you debug your logging issues
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> If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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