python 2.7 module boilerplate

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import sys
import logging

logger = logging.getLogger(__name__)
logger.addHandler(logging.NullHandler())  # Defaulting to null output in case Caculator class is imported

logging.basicConfig(filename='/error.log', filemode='a', level=logging.ERROR, format='%(asctime)s - %(levelname)s - %(message)s')

class ClassName(object):
    def __init__(self):
        """
        >>> 2 * 2
        4
        >>> 1 + 1
        2
        """
        logger.debug('Loading class')

if __name__ == '__main__':
    log_handler = logging.StreamHandler()

    # Looks like: 2015-11-16 13:07:24,481 - filename.__init__:12 - DEBUG - Logg message
    log_handler.setFormatter(logging.Formatter('%(asctime)s - %(module)s.%(funcName)s:%(lineno)d - %(levelname)s - %(message)s'))

    logger.addHandler(log_handler)  # Display info when running script manually
    logger.setLevel(logging.DEBUG)  # Set to logging.DEBUG for debug

    cn = ClassName()

    mode = sys.argv[1]

    if mode == 'test':
        logger.info('Running tests, no output means everything is fine!')
        import doctest
        doctest.testmod()

    if mode == 'fail':
        # Generic use of logging exceptions
        try:
            cn.fail()
        except Exception, e:
            # We shoulnt die, but log..
            logging.exception(e)

    sys.exit(0)