Record the Python logging you use

Recently want to write their own fragmented code embedded into an application, to take into account the various aspects of the debug, the logging looked at a bit, the use of the note.

• Print the log to the screen

Import logginglogging.debug (U' debug ') logging.info (u ' run ' ) logging.warning (u' warning ')# run display:# 
#默认情况下, logging prints warning levels above and prints to the screen.
#日志级别大小关系 CRITICAL > ERROR > WARNING > INFO > DEBUG > NOTSET (Default), and can be customized.

• Basicconfig function Configuration Log output

#-*-coding:utf-8-*-ImportLogginglogging.basicconfig ( level=logging. DEBUG, Format=u'% (asctime) s file:% (filename) s [% (Lineno) d row] level:% (levelname) s information:% (message) s', Datefmt='%Y%b%d%h:%m:%s,%a', filename='Guapeng.log', FileMode='W') logging.debug (U'Debug') logging.info (U'Information') logging.warning (U'Warning')#The guapeng.log file appears as follows#Jul 16:22:26,mon file: testlog.py [line 10th] Level: Debug Info: Debug#Jul 16:22:26,mon file: testlog.py [line 11th] Level: info: Info#Jul 16:22:26,mon file: testlog.py [line 12th] Level: WARNING info: Warning#basicconfig parameter Description:#filename: Specify the log file name#FileMode: Open mode, ' W ' or ' a '#Format : Specifies the formatting and content of the output, with some format default parameters:#% (levelno) s: Log level values#% (levelname) s: Log level name#% (pathname) s: The path of the current executing program, equivalent to Sys.argv[0]#% (filename) s: The currently executing program name (note that this is different from the log file name)#% (funcName) S: Current execution function#% (Lineno) d: Current line number#% (asctime) s: Current Time#% (thread) d: Thread ID#% (threadname) s: Thread name#% (process) d: Process ID#% (message) s: Log information#datefmt: Specifies the time format, as with Time.strftime ()#level: Sets the print log levels by default to logging. WARNING, the above example is debug, it is larger than debug output to the log file. #Stream: Specifies how the log is output, default output to Sys.stderr (screen), stream is ignored when stream and filename are specified simultaneously

• Print Debug Info to log file, print info to screen

#-*-coding:utf-8-*-ImportLogginglogging.basicconfig ( level=logging. DEBUG, Format=u'% (asctime) s file:% (filename) s [% (Lineno) d row] level:% (levelname) s information:% (message) s', Datefmt='%Y%b%d%h:%m:%s,%a', filename='Guapeng.log', FileMode='W')#defines a streamhandler that prints info-level information to the screenconsole =logging. Streamhandler () console.setlevel (logging.info) Formatter= Logging. Formatter ('% (name) -12s:% (levelname) -8s% (message) s') Console.setformatter (formatter) Log= Logging.getlogger ("'). AddHandler (console) logging.debug (U'Debug') logging.info (U'Information') logging.warning (U'Warning')#The guapeng.log file appears as follows#Jul 16:22:26,mon file: testlog.py [line 10th] Level: Debug Info: Debug#Jul 16:22:26,mon file: testlog.py [line 11th] Level: info: Info#Jul 16:22:26,mon file: testlog.py [line 12th] Level: WARNING info: Warning#The screen is displayed as follows#Root:info Information#root:warning Warning

• With the config file, the log files are stored on a daily basis, and only one week of log is saved.

Python code

#-*-coding:utf-8-*-ImportLoggingImportLogging.config#Import configuration fileLogging.config.fileConfig ("logging.conf") #Create LoggerLoggerinfo = Logging.getlogger ("Timeinfologger") #Test CodeLoggerinfo.debug ("Debug Message") Loggerinfo.info ("Info Message") Loggerinfo.warn ("warn message") Loggerinfo.error ("error Message") loggerinfo.critical ("Critical Message")

logging.conf File Code

#define the Logger module, root is the parent class, must exist, and other classes are defined by themselves. [Loggers]keys=Root,timeinfologger#Define Handler[Handlers]keys=Timeinfohandler#Defining output formats[Formatters]keys=timeinfofmt#--------------------------------------------------#to implement the logger module defined above, it must be a form of [logger_xxxx]#--------------------------------------------------#[logger_xxxx] logger_ module name#Level with Debug, INFO, WARNING, ERROR, CRITICAL#handlers processing class, can have multiple, separated by commas#Qualname Logger Name, the application is obtained through Logging.getlogger. For names that cannot be obtained, the root module is logged. #whether the propagate inherits the log information of the parent class, 0: No 1: Yes[Logger_root]level=infohandlers=Timeinfohandler[logger_timeinfologger]level=infohandlers=timeinfohandlerpropagate=0qualname=Timeinfologger#--------------------------------------------------#Handler#--------------------------------------------------#[Handler_xxxx]#class Handler category name#level log Levels#formatter, the formatter defined above#args handler initialization function arguments[Handler_timeinfohandler]class=Logging.handlers.TimedRotatingFileHandlerlevel=Infoformatter=Timeinfofmtargs=('C:\\users\\tyanf\\desktop\\error.log','Midnight', 1, 6)#--------------------------------------------------#Log Format#--------------------------------------------------#% (Asctime) s year-month-day time-minute-second, millisecond 2013-04-26 20:10:43,745#% (filename) s file name, excluding directories#% (pathname) s directory name, full path#% (funcName) s function name#% (levelname) S-Class aliases#% (Lineno) d line number#% (module) s module name#% (message) s message body#% (name) s log Module name#% (process) d process ID#% (processName) s process name#% (thread) d thread ID#% (threadname) s thread name[Formatter_timeinfofmt]format=% (asctime) s% (levelname) s%(message) sdatefmt=class=logging. Formatter

# The test time is from July 20 to July 27, and the last file library is displayed as follows: # error.log.2015-07-21 # error.log.2015-07-22 # error.log.2015-07-23 # error.log.2015-07-24 # error.log.2015-07-25 # error.log.2015-07-26 # Error.log # where error.log.2015-07-20 because the program set Backupcount to 6, when more than 6 o'clock the earliest delete, and then add a new log file, it has been deleted. 

Resources:

http://my.oschina.net/leejun2005/blog/126713

Https://docs.python.org/2/library/logging.handlers.html

Record the Python logging you use