How to log both to console and file using Python?

Question

I am working Python and I need to logger so I decided to start using RotatingFileHandler. Below is my logging.conf file

[loggers]
keys=root

[handlers]
keys=logfile

[formatters]
keys=logfileformatter

[logger_root]
level=DEBUG
handlers=logfile

[formatter_logfileformatter]
format=%(asctime)s %(name)-12s: %(levelname)s %(message)s

[handler_logfile]
class=handlers.RotatingFileHandler
level=NOTSET
args=('ookagent.log', 'a', 50000000000, 5)
formatter=logfileformatter

And below is my Python script from which I am successfully able to log to the files. But I am not sure how to log both to files and console as well.

#!/usr/bin/python
import logging
import logging.config
import logging.handlers

# using RotatingFileHandler for logging purpose
logging.config.fileConfig('logging.conf')
ooklogger = logging.getLogger('')


ooklogger.info("HelloWorld")

Can we make a change in my logging.conf file by which I can login both to console and files as well? Is it possible to do that?

This is just for my debugging purpose.. In production I won't use this.. I am testing something and everytime I need to go and look for the files.. — AKIWEB
– AKIWEB, Commented Dec 24, 2013 at 22:23
Well i think you can use the command tail with the argument -f this in one console this will watch the file and when a new line is added this one will appear in the console for example: tail -f myfile.log — Victor Castillo Torres
– Victor Castillo Torres, Commented Dec 24, 2013 at 22:30

David Z · Accepted Answer · 2013-12-24 22:50:37Z

1

Sure, the logging configuration file format lets you specify multiple handlers. You can use a StreamHandler to log to the console. That would entail modifications like these to your config file:

[handlers]
keys=logfile,logconsole

[handler_logconsole]
class=StreamHandler
# other configuration directives as you like

[logger_root]
handlers=logfile,logconsole

See the config file documentation for more information and examples.

answered Dec 24, 2013 at 22:50

David Z

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2 Comments

AKIWEB Over a year ago

Thanks for suggestion. I tried that and it gives me error as NoOptionError and I guess I need to add some configuration as you have mentioned in your answer but what configuration I should be adding for logging to console? I am little bit rusty in Python as it is not my first language.

David Z Over a year ago

That's entirely up to you. But as I said, see the documentation for more information and examples.

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