Demonstrate use of Python's basic log operations

logging_demo.py

# -*- coding: utf-8 -*-
""" Purpose: Demonstrate use of Python's basic log operations

Created: 2017-09-01
Contact:  dhohls@csir.co.za

Usages::

    python logging_demo.py
    python logging_demo.py -ll=ERROR
"""

__author__ = "Derek Hohls"
__version__ = "0.1.1"

from __future__ import print_function
import argparse
import logging
import sys

log = logging.getLogger(__name__)

LOG_LEVEL = 'INFO'


class LogTest(object):

    def test(self):
        """"Test use of log."""
        log.critical('test critical')
        log.error('test error')
        log.warn('test warn')
        log.info('test info')
        log.debug('test debug')


def main(args):
    """Process args."""
    print(args)
    logging.basicConfig(
        stream=sys.stdout,
        format='%(asctime)s %(levelname)-8s [%(filename)s:%(lineno)d %(funcName)s()] %(message)s',
        level=getattr(logging, args.loglevel))
    # test
    logging.critical('critical')
    logging.error('error')
    logging.warn('warn')
    logging.info('info')
    logging.debug('debug')
    print('logging.DEBUG =', logging.DEBUG)
    # extra test
    LogTest().test()


if __name__ == '__main__':
    PARSER = argparse.ArgumentParser()
    PARSER.add_argument(
        '-ll', '--loglevel', default=LOG_LEVEL,
        choices=['DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL'],
        help="Set log level for service (%s)" % LOG_LEVEL)
    ARGS = PARSER.parse_args()
    LOG_LEVEL = ARGS.loglevel
    main(ARGS)