INFO ) # set a format which is simpler for console use formatter = logging. DEBUG, format = ' %(asctime)s %(name)-12s %(levelname)-8s %(message)s ', datefmt = '%m- %d %H:%M', filename = '/tmp/myapp.log', filemode = 'w' ) # define a Handler which writes INFO messages or higher to the sys.stderr console = logging. Import logging # set up logging to file - see previous section for more details logging. Let’s also assume that the file should contain timestamps, but the console Say you want to log messages with levels of DEBUGĪnd higher to file, and those messages at level INFO and higher to the console. Let’s say you want to log to console and file with different message formats and Modify the severity level of the logger and/or handler to debug. At that time, the only change that needs to happen is to
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Statements can remain intact in the source code and remain dormant until you Statements, which you will have to delete or comment out later, the bug Print statements for debugging, use bug: Unlike the print Very helpful when writing and testing an application. The ability to create new handlers with higher- or lower-severity filters can be That changed was the addition and configuration of a new handler named fh. Notice that the ‘application’ code does not care about multiple handlers. addHandler ( fh ) # 'application' code logger. setFormatter ( formatter ) # add the handlers to logger logger. Formatter ( ' %(asctime)s - %(name)s - %(levelname)s - %(message)s ' ) ch. ERROR ) # create formatter and add it to the handlers formatter = logging. DEBUG ) # create console handler with a higher log level ch = logging. DEBUG ) # create file handler which logs even debug messages fh = logging. Previous simple module-based configuration example: The logging calls in theĪpplication code will remain unchanged. This up, simply configure the appropriate handlers. Text file while simultaneously logging errors or above to the console. Will be beneficial for an application to log all messages of all severities to a Minimum or maximum quota for the number of handlers you may add. Works for more threads than shown here, of course.
This shows the logging output interspersed as one might expect. Shows logging from the main (initial) thread and another thread: Logging from multiple threads requires no special effort. 23:47:11,673 - spam_application - INFO -ĭone with auxiliary_module.some_function() 23:47:11,670 - spam_application - INFO -įinished auxiliary_something 23:47:11,668 - spam_application - INFO -Ĭalling auxiliary_something 23:47:11,665 - spam_application - INFO -Ĭreated an instance of auxiliary_module.Auxiliary 23:47:11,663 - spam_application - INFO -Ĭreating an instance of auxiliary_module.Auxiliary info ( 'done with auxiliary_module.some_function()' ) info ( 'calling auxiliary_module.some_function()' ) auxiliary_module. info ( 'finished auxiliary_something' ) logger. info ( 'calling auxiliary_something' ) a. info ( 'created an instance of auxiliary_module.Auxiliary' ) logger. info ( 'creating an instance of auxiliary_module.Auxiliary' ) a = auxiliary_module. setFormatter ( formatter ) # add the handlers to the logger logger. Formatter ( ' %(asctime)s - %(name)s - %(levelname)s - %(message)s ' ) fh. Import logging import auxiliary_module # create logger with 'spam_application' logger = logging. Adding handlers other than NullHandler to a logger in a library.Using loggers as attributes in a class or passing them as parameters.Opening the same log file multiple times.
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Adding contextual information to your logging output.Running a logging socket listener in production.Sending and receiving logging events across a network.
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