Python logging calling module from multiple places

Question

I would like to set up a logging hierarchy for my project using python's logging module and the dot '.' name structure described here: https://docs.python.org/2/library/logging.html#logging.getLogger

For a given module (bar.py), I would like to set up the logger something like:

log = logging.getLogger('x.bar')

Where I can then use log.(debug/info/warning/etc...) throughout the bar.py module. I know that bar.py will never be run directly, but functions within it could possibly be called from several other modules - so I don't know advance what to set 'x' to in the code snippet. I want bar.py to inherit the logging handlers and formatters from it's caller (x).

Possible duplicate of python.logging: Why does my non-basicConfig setting not work? — Joe
– Joe, Commented Jul 16, 2018 at 19:34

Omni · Accepted Answer · 2018-07-16 19:56:07Z

0

The standard approach of having a module-wide logger instantiated via logging.getLogger('mymodule') is not tailored for your intended behaviour. What you should do instead is to let the callers pass the logger as an argument to the functions in your module

# mymodule.py
def foo(plogger, a, b):
    logger=plogger.getChild('bar')
    ...

answered Jul 16, 2018 at 19:56

Omni

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