The logging of Python module learning

FileName: Creates a filedhandler with the specified file name (the concept of handler is explained in the back) so that the log is stored in the specified file. FileMode: File is opened by using this parameter when filename is specified, and the default value is "a" and can be specified as "W". Format: Specifies the log display format used by handler. DATEFMT: Specifies the date time format. Level: Set Rootlogger (The following explains the specific concept) stream: Create Streamhandler with the specified stream. You can specify the output to Sys.stderr,sys.stdout or to a file, and the default is Sys.stderr. If you list both the filename and stream two parameters, the stream parameter is ignored. Formatted string that may be used in the format parameter:% (name) s logger name% (Levelno) s number form log level% (levelname) s text form log level% (pathname) s The full pathname of the module that calls the log output function, The file name of the module that may not have% (filename) s call log output function% (module) s call log output function module name% (funcName) s call log output function name% (Lineno) d Call Log output function The statement that is located in the line% ( Created) F current time, the current time in the number of milliseconds (asctime) s string as a percentage of the time that the UNIX standard represents a floating-point (relativecreated) d output log information, since logger was created. The default format is "2003-07-08 16:49:45,896". The comma is followed by the millisecond% (thread) d thread ID. There may not be a% (threadname) s thread name. There may not be a% (process) d process ID. Messages that may not have a% (message) s user output

Example:

Import Logging  logging.basicconfig (level=logging. DEBUG,          format= '% (asctime) s% (filename) s[line:% (lineno) d]% (levelname) s% (message) s ',          datefmt= '%Y,%b%d%a%H :%m:%s ',          filename= ' Test.log ',          filemode= ' W ')  logging.debug (' 1 ')  logging.info (' 2 '  ) Logging.warning (' 3 ')  logging.error (' 4 ')  logging.critical (' 5 ')  results: Jul Wed 11:45:50 E01.py[line : 8] DEBUG 12017, Jul Wed 11:45:50 e01.py[line:9] INFO 22017, Jul Wed 11:45:50 e01.py[line:10] WARNING 32017, Jul 19 Wed 11:45:50 E01.py[line:11] ERROR 42017, Jul Wed 11:45:50 E01.py[line:12] CRITICAL 5

Common usage:

Logging configuration file

Logging.conf

    [Loggers]      Keys=root,simpleexample [            handlers]      keys=consolehandler            [formatters]      keys=simpleformatter            [ Logger_root]      level=debug      handlers=consolehandler            [logger_simpleexample]      level=debug      Handlers=consolehandler      qualname=simpleexample      propagate=0            [Handler_consolehandler]      class= Streamhandler      level=debug      formatter=simpleformatter      args= (sys.stdout,)            [Formatter_ Simpleformatter]      format=% (asctime) s-% (name) s-% (levelname) s-% (message) s      datefmt=  

Program Examples:

    Import Logging        import logging.config                logging.config.fileConfig ("logging.conf")    # with config file                 # Create Logger         logger = Logging.getlogger ("Simpleexample")                # "Application" code         logger.debug ("Debug Message")        logger.info ("info message")        Logger.warn ("Warn message")        logger.error ("error message        ") Logger.critical ("critical Message")  

The logging of Python module learning