PYTHON LOGGING with StreamHandler and FileHandler

Ganesh Pal ganesh1pal at gmail.com
Mon Nov 24 12:38:12 CET 2014


Hi Team,


The below program logs all the messages to the log file and displays the
same on the console .

Please suggest how do I ensure that error and warning log levels go ONLY to
stdout and/or stder


Code :

import logging
import sys

# StreamHandler
root = logging.getLogger()
root.setLevel(logging.DEBUG)

ch = logging.StreamHandler(sys.stdout)
ch.setLevel(logging.DEBUG)
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s -
%(message)s')
ch.setFormatter(formatter)
root.addHandler(ch)


# FileHandler

logger = logging.getLogger('myapp')
ch  = logging.FileHandler('/var/tmp/myapp1.log')
logger.setLevel(logging.DEBUG)

logger.error('We have a problem')
logger.info('While this is just chatty')
print "error abort" ## should be displayed on screen with using
loggin.<something>

output :

# python  modified_logger.py
2014-11-24 11:18:12,355 - myapp - ERROR - We have a problem
2014-11-24 11:18:12,356 - myapp - INFO - While this is just chatty
error abort

# echo > /var/tmp/myapp1.log
# python  modified_logger.py
2014-11-24 11:18:45,872 - myapp - ERROR - We have a problem
2014-11-24 11:18:45,872 - myapp - INFO - While this is just chatty
error abort

Regards,
Ganesh
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