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When programming or debugging, we may want to focus on certain types of events. Lucky for us, there are defined logging levels that indicate specific levels of severity for a log message. Each logging level is a constant within the logging module with an associated numeric value. The higher this numeric value, the higher the severity of the log message. Each logging level is defined as:

Level Value
NOTSET 0
DEBUG 10
INFO 20
WARNING 30
ERROR 40
CRITICAL 50

We should use logging.DEBUG to provide detailed information that is useful for debugging the application. It has a numeric value of 10.

We should use logging.INFO for general operations where expected information or output is logged. It has a numeric value of 20.

We should use logging.WARNING to alert us to a current or impending, unexpected issue or error. This logging level does mean that the software or application will continue to run despite the warning message. It has a numeric value of 30.

We should uselogging.ERROR to indicate serious problems that cause functionality within the software or application to break. It has a numeric value of 40.

We should use logging.CRITICALfor the most severe of errors and issues. These errors indicate that the software or application may stop running altogether. It has a numeric value of 50.

Finally, the logging.NOTSET logging level searches for the first non-NOTSET ancestor logger and inherits its logging level. If there is none, our output threshold will be zero.

Instructions

1.

Print the numeric values of each logging level. Remember to import the logging module. Later in this lesson, we will show how we can use these levels to control which logging messages get outputted.

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