Python------Logging Module

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Logging

Functional Simple Configuration

Import Logging
Logging.debug ('debug')
Logging.info ('info')

Logging.warning (' wrong ')

logging.error ('error message'

Logging.critical ('critical message'

Default logging level is set to Warning (critical>error>warning>info>debug)

Flexible configuration log level, log format, output location:

ImportLogginglogging.debug ('Debug') Logging.info ('Info') logging.warning ('something went wrong.') Logging.basicconfig ( level=logging. DEBUG) Logging.debug ('Debug') Logging.info ('Info') logging.warning ('something went wrong.') Logging.error ('Error')Print('% (name) s')

Configuration parameters

The logging.basicconfig () function can change the default behavior of the logging module through specific parameters, with the available parameters: FileName: Creates a filedhandler with the specified file name so that the log is stored in the specified files. 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 output to Sys.stderr,sys.stdout or file (f=open (' Test.log ', ' W ')), default is Sys.stderr. If you list both the filename and stream two parameters, the stream parameter is ignored. formatting strings that may be used in the format parameter:%(name) s Logger's name%(Levelno) s log level in digital form%(levelname) s log level in text form%(pathname) s The full pathname of the module that invokes the log output function, possibly without%(filename) s The file name of the module that invokes the log output function%module Name of the log output function called by (module) s%(funcName) s function name of the call log output function%(Lineno) d The line of code where the statement that invokes the log output function%(created) F current time, represented by the UNIX standard floating-point number representing the time%(relativecreated) d when the log information is output, the number of milliseconds since logger was created% (asctime) s The current time in string form. The default format is "2003-07-08 16:49:45,896". The comma is followed by milliseconds%(thread) d thread ID. Probably not .%(threadname) s thread name. Probably not .%(process) d ID. Probably not .% (message) s user-output message

parameter Configuration

Logging Object Configuration

ImportLoggingdefMy_logger (Filename,file=true,stream =True): Logger=Logging.getlogger () Formatter= Logging. Formatter (fmt='% (name) s% (asctime) s [% (Lineno) d]--% (message) s', Datefmt='%d/%m/%y%h:%m:%s') Logging.setlevel (logging. DEBUG)ifFile:file_handler= Logging. Filehandler (filename,encoding='Utf-8') File_handler.setformatter (formatter)#file Stream file operatorsLogger.addhandler (File_handler)ifStream:stream_handler=logging. Streamhandler () Stream_handler.setformatter (formatter)#screen flow screen operatorLogger.addhandler (Stream_handler)returnLoggerlogger= My_logger ('Logging', file=False) logger.warning ("something went wrong.") logging. DEBUG ('Debug')

Python------Logging Module