Python-将日志写入文件

Question

I currently have logging setup for console.

Im invoking my config using :

import logging
import logging.config

logging.config.fileConfig('logging.conf')
logger = logging.getLogger('osPatch')

My config is ::

[loggers]
keys=root,osPatch

[handlers]
keys=consoleHandler

[formatters]
keys=osPatch

[logger_root]
level=DEBUG
handlers=consoleHandler

[logger_osPatch]
level=DEBUG
handlers=consoleHandler
qualname=osPatch
propagate=0

[handler_consoleHandler]
class=StreamHandler
level=DEBUG
formatter=osPatch
args=(sys.stdout,)

[formatter_osPatch]
format=%(asctime)s - %(name)s - %(levelname)s - %(message)s
datefmt=

This gives me console level logging perfectly fine.

Now I want the same logs to be written to a file.

What im trying to do is edit my config file and use a fileHandler .

So Im editing my config file to :

[loggers]
keys=root,osPatch

[handlers]
keys=consoleHandler,FileHandler

[handler_FileHandler]
filename=example.log
level=DEBUG
formatter=osPatch

This gives me an ERROR :

Traceback (most recent call last):
  File "apply_errata.py", line 1, in <module>
    import satellite_utils
  File "/root/config-3.1.25/automated-os-patching/satellite_utils.py", line 3, in <module>
    import system_utils
  File "/root/config-3.1.25/automated-os-patching/system_utils.py", line 4, in <module>
    import processing_utils
  File "/root/config-3.1.25/automated-os-patching/processing_utils.py", line 7, in <module>
    logging.config.fileConfig('logging.conf')
  File "/usr/lib64/python3.4/logging/config.py", line 85, in fileConfig
    _install_loggers(cp, handlers, disable_existing_loggers)
  File "/usr/lib64/python3.4/logging/config.py", line 253, in _install_loggers
    logger.addHandler(handlers[hand])
KeyError: 'FileHandler'

What am I doing wrong here ?

Answer 1

Not sure how your full config file looks, but that traceback in my experience indicate that the handler key isn't properly declared in the handler section.

For reference, this is a tried and working version of the config file I think you aim to create:

[loggers]
keys=root,osPatch

[handlers]
keys=consoleHandler,FileHandler

[formatters]
keys=osPatch

[logger_root]
level=DEBUG
handlers=consoleHandler,FileHandler

[logger_osPatch]
level=DEBUG
handlers=consoleHandler,FileHandler
qualname=osPatch
propagate=0

[handler_consoleHandler]
class=StreamHandler
level=DEBUG
formatter=osPatch
args=(sys.stdout,)

[handler_FileHandler]
class=FileHandler
level=DEBUG
formatter=osPatch
args=('example.log',)

[formatter_osPatch]
format=%(asctime)s - %(name)s - %(levelname)s - %(message)s
datefmt=