simple configurable logging for one-off scripts

log_example.py

#!/usr/bin/env python
# encoding: utf-8
"""
Call me like this::

    python log_example.py

To set the log level::

    LOGLEVEL=INFO log_example.py

Lowercase is OK too::

    LOGLEVEL=debug log_example.py
"""
import logging
import os

try:
    loglevel = getattr(logging, os.environ.get('LOGLEVEL', 'WARN').upper())
except AttributeError:
    pass

logging.basicConfig(level=loglevel)
log = logging.getLogger(__name__)


if __name__ == '__main__':
    log.debug('this is a debug message')
    log.info('this is an info message')
    log.warn('this is a warn message')