Python: logging: format logging messages

By setting ‘format’ argument to logging.basicConfig() method, we can format the log messages.

import logging

logger = logging.getLogger()
logging.basicConfig(level=logging.DEBUG, format='%(asctime)s %(name)-12s %(levelname)-8s %(message)s %(funcName)s')

def logMessages():
    logger.debug("Debug message")
    logger.info("Information Message")
    logger.warn("Warning Message")
    logger.error("Error Message")
    logger.critical("Critical Message")

if (__name__ == "__main__"):
    logMessages()

Run above program, you will get following output.

2015-10-22 22:55:19,096 root         DEBUG    Debug message logMessages
2015-10-22 22:55:19,096 root         INFO     Information Message logMessages
2015-10-22 22:55:19,096 root         WARNING  Warning Message logMessages
2015-10-22 22:55:19,097 root         ERROR    Error Message logMessages
2015-10-22 22:55:19,097 root         CRITICAL Critical Message logMessages

Following are different format attributes supported by python.

Format	Description
%(asctime)s	Displays the time of log record creation in human readable format. The format is of the form '2015-10-22 22:55:19,096'. The numbers after the comma (,) represents milli seconds.
%(created)f	Represents the time when the LogRecord was created.
%(filename)s	File name portion of the pathname.
%(funcName)s	Name of the function is logged
%(levelname)s	Text logging level for the message ('DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL').
%(levelno)s	Numeric logging level for the message.
%(lineno)d	Line number, from where the logging call was issued.
%(module)s	Module name
%(msecs)d	Millisecond portion of the time when the LogRecord was created.
%(message)s	The logged message, computed as msg % args.
%(name)s	Name of the logger used to log the call.
%(pathname)s	Full pathname of the source file where the logging call was issued
%(process)d	Process Id
%(processName)s	Process Name
%(relativeCreated)d	Time in milliseconds when the LogRecord was created, relative to the time the logging module was loaded.
%(thread)d	Thread ID.
%(threadName)s	Thread name

Previous                                                 Next                                                 Home