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Logging

To log info messages from within an App, Model or Controller object:

self.logger.info("information message")

To log warning messages:

self.logger.warn("warning message")

To log error messages:

self.logger.error("error message")

To log critical messages:

self.logger.critical("critical message")

You can configure the logging level so that only messages at and above that level are logged (to learn more read the Configuration guide):

LEVEL=ERROR python hello.py

If the app is run with a logging level of ERROR and the following lines are executed:

self.logger.info("info message")
self.logger.warn("warning message")
self.logger.error("error message")
self.logger.critical("critical message")

The output would be the following:

error message
critical message

It's possible to write the log to file using the FILE_LOG configuration variable:

FILE_LOG=1 python hello.py