Overwrite python logging configuration at runtime

Question

I have a basic configuration set in my project

From, for example __init__.py:

import logging
logging.basicConfig(level=logging.INFO)

And I would like to change the global level at runtime after reading user parameters. Is that possible without moving the previous lines after that?

A full example will be something like the following:

logger = logging.getLogger(__name__)

def run():
    parser = OptionParser()
    parser.add_option("--debug", dest="debug",
                      action="store_true",
                      help="flag to indicate if debug should be enabled",
                      default=False)
    (options, args) = parser.parse_args()

    if options.debug:
        # change the logging configuration
        pass
        #logging.basicConfig(level=logging.DEBUG)

    # call the application code

See my answer below for your question, just pointing out that optparse module has been deprecated, please switch to using argparse — Alex
– Alex, Commented Jul 5, 2019 at 20:18

aitorhh · Accepted Answer · 2019-07-05 20:40:27Z

2

Use Logger.setLevel:

logger = logging.getLogger(__name__)
...

if options.debug:
    logger.setLevel(logging.DEBUG)

EDIT:

If you want to set the level of all loggers currently available you can do something like this:

loggers = [logging.getLogger(name) for name in logging.root.manager.loggerDict]
for logger in loggers:
    logger.setLevel(logging.DEBUG)

Or you can mimic the behavior of logging.basicConfig:

logging.root.setLevel(logging.DEBUG)

edited Jul 5, 2019 at 20:40

aitorhh

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answered Jul 5, 2019 at 20:15

Alex

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2 Comments

aitorhh Over a year ago

This solution configures the level at a given logger (in the same file), it does not applies to all the available loggers like logger.basicConfig does.

aitorhh Over a year ago

Thanks for the solution!

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