Exhaustive python logging example.

python_logging.py

#!/usr/bin/env python
import sys
import logging

# Do this in the top level of your module.
logging.root.setLevel(logging.DEBUG)  # Or root logger level might override yours.
fmter = logging.Formatter("%(asctime)s %(levelname)s %(name)s(%(lineno)d): %(message)s")
# h = logging.FileHandler("logfile.log")
h = logging.StreamHandler(sys.stderr)
h.setFormatter(fmter)
h.setLevel(logging.DEBUG)
logging.root.addHandler(h)

# Use like this
import logging
logger = logging.getLogger("test_script")

# In your code
logger.debug("debug message")
logger.info("Every level is represented by a method on the logger object.")
logger.warning("Warnings too.")
logger.error("Of course, you can use format strings (%s %s)", "but syntax is a little bit", "different")
try:
    this_raises_an_exception()
except:
    logger.exception("after this, the full exception is posted to the log (it will show upp as log level ERROR)")