How can INFO and DEBUG logging message be sent to stdout and higher level message to stderr

Question

Is there an easy way with python\'s logging module to send messages with a DEBUG or INFO level and the one with a higher level to different streams?

Is it a good ide

Answer 1

right from the updated docs, it cover this case pretty well now.

http://docs.python.org/howto/logging.html#logging-advanced-tutorial

import sys # Add this.
import logging

# create logger
logger = logging.getLogger('simple_example')
logger.setLevel(logging.DEBUG)

# create console handler and set level to debug
ch = logging.StreamHandler( sys.__stdout__ ) # Add this
ch.setLevel(logging.DEBUG)

# create formatter
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')

# add formatter to ch
ch.setFormatter(formatter)

# add ch to logger
logger.addHandler(ch)

# 'application' code
logger.debug('debug message')
logger.info('info message')
logger.warn('warn message')
logger.error('error message')
logger.critical('critical message')

i've mentioned on comments the two changes required from the example to make the output go to stdout. you may also use filters to redirect depending on the level.

more information to understand the changes is at http://docs.python.org/library/logging.handlers.html#module-logging.handlers