Highlight keywords in log files in various colours, that are typically used in Log4-configurations (Log4Java, Log4Python, Log4Perl, etc..). The keywords are ERROR, INFO, WARNING, DEBUG, TRACE, SECURITY, FATAL, TODO, TIMEOUT, and can easily be changed in the script.

logwatch.sh my_app_logfile.log

Manually copy logfile.sh to /usr/local/bin

Optionally create a symlink so that you can just type "logwatch".

cd /usr/local/bin

ln -s logwatch.sh logwatch

This will set up basic logging to a log file called [your_appname].log

logger = logging.getLogger(__name__) 
logger.setLevel(logging.DEBUG)
formatter = logging.Formatter('[%(asctime)s][%(levelname)s][%(message)s]',datefmt='%Y%m%d %H:%M:%S')
file_handler=logging.FileHandler(__file__.replace('.py','.log'))
file_handler.setFormatter(formatter)
file_handler.setLevel(logging.DEBUG)     # <-- write logger entries down to DEBUG level to file
stream_handler=logging.StreamHandler()
stream_handler.setFormatter(formatter)
stream_handler.setLevel(logging.WARNING)   # <-- write logger entries down to WARNING level to display
logger.addHandler(stream_handler)
logger.addHandler(file_handler)

You can use the standard logging functions logger.critical(msg), logger.error(msg), logger.info(msg), logger.debug(msg), logger.trace(msg).

You can also add your own custom logging levels, such as one for TIMEOUT error, for example, and then start using the new function, logger.timeout(msg)

logging.addLevelName(logging.TIMEOUT, "TIMEOUT")
def timeout(self, message, *args, **kws):    
    self._log(logging.TIMEOUT, message, args, **kws) 
logging.Logger.timeout = timeout