Python logging not working

Question

I'm loading my logging configuration from a file. The log file is given below:

[loggers]
keys=root

[handlers]
keys=consoleHandler,fileHandler

[formatters]
keys=simpleFormatter

[logger_root]
level=DEBUG
handlers=consoleHandler,fileHandler

[handler_consoleHandler]
class=StreamHandler
level=INFO
formatter=simpleFormatter
args=(sys.stderr,)

[handler_fileHandler]
class=FileHandler
level=DEBUG
formatter=simpleFormatter
args=('../output.log','w')

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

And I create a logger using:

_logger = logging.getLogger(__name__)
logging.config.fileConfig('../logging.conf')

However, I do not see any logging output when I run my program. If I add a separate logger for my main module, then logging works as expected. But set up like this it doesn't work. What am I doing wrong?

@HennyH added statement to show how I'm loading the config file. — K G
– K G, Commented May 11, 2013 at 12:49

DX2003 · Accepted Answer · 2013-05-23 20:35:13Z

1

You need to place the logger creation after configuration. The logging.fileConfig call will disable the pre-existing loggers which is why your logger isn't working.

answered May 23, 2013 at 20:35

DX2003

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DX2003 Over a year ago

Or alternatively set the keyword argument disable_existing_loggers=False.

HennyH · Accepted Answer · 2013-05-11 01:44:19Z

1

By creating the log file like so:

_logger = logging.getLogger(__name__)

It will look for a file with the name with the value of __main__, which your main module will have equal to "__main__". However the other modules you import will have __name__ equal to the module name of the module.

edited May 11, 2013 at 1:44

answered May 11, 2013 at 0:43

HennyH

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2 Comments

K G Over a year ago

That's not how I'm creating the log file. That's just how I'm creating the logger. And I've edited my post to show how I'm loading the lagging config file.

K G Over a year ago

Regardless, shouldn't messages me forwarded to the root logger by the main logger? Why aren't they being output?

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