Python writes logs to a file and console instance via logging

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As shown below:

Import Logging # Creates a logger logger = Logging.getlogger (' MyLogger ') logger.setlevel (logging. DEBUG) # Creates a handler that is used to write to the log file FH = logging. Filehandler (' Test.log ') fh.setlevel (logging. DEBUG) # Then create a handler for output to the console ch = logging. Streamhandler () Ch.setlevel (logging. DEBUG) # defines the output format of the handler formatter = logging. Formatter (' [% (asctime) s][% (thread) d][% (filename) s][line:% (Lineno) d][% (LevelName) s] # #% (message) s ') Fh.setformatter (Formatter) Ch.setformatter (formatter) # Add Logger handler (FH) Logger.addhandler to Logger.addhandler (ch # Record a log logger.info (' Foorbar ')

With regard to the configuration of formatter, the use of the form of% (<dict key>) s is the dictionary keyword substitution. The keywords provided include:

Format	Description
% (name) s	Name of the Logger (logging channel).
% (Levelno) s	Numeric logging level for the message (DEBUG, INFO, WARNING, ERROR, CRITICAL).
% (LevelName) s	Text logging level for the message (' DEBUG ', ' INFO ', ' WARNING ', ' ERROR ', c27> ' CRITICAL ').
% (pathname) s	Full pathname of the source file where the logging is issued (if available).
% (filename) s	Filename portion of pathname.
% (module) s	Module (name portion of filename).
% (FuncName) s	Name of function containing the logging call.
% (Lineno) d	Source line number where the logging is issued (if available).
% (created) f	time when the LogRecord is created (as returned by Time.time ()).
% (relativecreated) d	Time in milliseconds when the LogRecord is created, relative to the time of the logging module was loaded.
% (Asctime) s	Human-readable time when the LogRecord is created. By default this is the form "2003-07-08 16:49:45,896" (the numbers after the comma was millisecond portion of the time) .
% (msecs) d	Millisecond portion of the time when the LogRecord was created.
% (thread) d	Thread ID (if available).
% (ThreadName) s	Thread name (if available).
% (process) d	Process ID (if available).
% (message) s	The logged message, computed as msg % args.