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Here's a simple logging example that just logs to a file. In order, it creates a Logger instance, then a FileHandler and a Formatter. It attaches the Formatter to the FileHandler, then the FileHandler to the Logger. Finally, it sets a debug level for the logger.
import logging
logger = logging.getLogger('myapp')
hdlr = logging.FileHandler('/var/tmp/myapp.log')
formatter = logging.Formatter('%(asctime)s %(levelname)s %(message)s')
hdlr.setFormatter(formatter)
logger.addHandler(hdlr)
logger.setLevel(logging.WARNING)
We can use this logger object now to write entries to the log file:
logger.error('We have a problem')
logger.info('While this is just chatty')
If we look in the file that was created, we'll see something like this:
2003-07-08 16:49:45,896 ERROR We have a problem
The info message was not written to the file - we called the setLevel
method to say we only wanted WARNING or worse, so the info message is discarded.
The timestamp is of the form ``year-month-day hour:minutes:seconds,milliseconds.'' Note
that despite the three digits of precision in the milliseconds field, not all systems provide
time with this much precision.
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