add custom handler with Python logging

Question

I have been working on this almost all day couldn't figure what I am missing. I am trying to add a custom handler to emit all log data into a GUI session. It works but the handler doesn't extend to the submodules and just emits records from the main module. Here is a small snippet I tried

I have two files

# main.py
import logging

import logging_two

def myapp():
    logger = logging.getLogger('myapp')
    logging.basicConfig()
    logger.info('Using myapp')
    ch = logging.StreamHandler()
    logger.addHandler(ch)
    logging_two.testme()
    print logger.handlers

myapp()

Second module

#logging_two
import logging

def testme():
    logger = logging.getLogger('testme')
    logger.info('IN test me')
    print logger.handlers

I would expect the logger in logging_two.testme to have the handler I have added in the main module. I looked at the docs to me it seems this should work but I am not sure if I got it wrong?

the result I get is

[]
[<logging.StreamHandler object at 0x00000000024ED240>]

How did you get the result? Using dir() in which module? If you want testme to be logging from ch in myapp, just pass ch as a function to testme def testme(ch): — BenJ
– BenJ, Commented Jan 22, 2016 at 1:27

OpenUserX03 · Accepted Answer · 2016-01-22 01:27:05Z

1

In myapp() you are adding the handler to the logger named 'myapp'. Since testme() is getting the logger named 'testme' it does not have the handler since it is a different part of the logging hierarchy.

If you just have logger = logger.getLogger() in myapp() then it would work since you are adding the handler to the root of the hierarchy.

Check out the python logging docs.

answered Jan 22, 2016 at 1:27

OpenUserX03

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1 Comment

skar Over a year ago

Thanks so much! I was under the impression the point of entry would always be picked as the root logger my bad.

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