Logging to a single file from multiple processes Using custom cookbook software. This page contains a number of recipes related to logging, which have been found useful in the past.
This is true not only within the same module, but also across modules as long as it is in the same Python interpreter process. 2005-03-23 23:47:11,663 – spam_application – INFO – creating an instance of auxiliary_module. Auxiliary – INFO – creating an instance of Auxiliary 2005-03-23 23:47:11,665 – spam_application – INFO – created an instance of auxiliary_module. Auxiliary 2005-03-23 23:47:11,668 – spam_application – INFO – calling auxiliary_module. Logging from multiple threads requires no special effort.
This shows the logging output interspersed as one might expect. This approach works for more threads than shown here, of course. To set this up, simply configure the appropriate handlers. The logging calls in the application code will remain unchanged. All that changed was the addition and configuration of a new handler named fh. The ability to create new handlers with higher- or lower-severity filters can be very helpful when writing and testing an application.
Unlike the print statements, which you will have to delete or comment out later, the logger. Let’s say you want to log to console and file with different message formats and in differing circumstances. Say you want to log messages with levels of DEBUG and higher to file, and those messages at level INFO and higher to the console. Let’s also assume that the file should contain timestamps, but the console messages should not.
Handler which writes INFO messages or higher to the sys. Now, we can log to the root logger, or any other logger. Jackdaws love my big sphinx of quartz. Quick zephyrs blow, vexing daft Jim. How quickly daft jumping zebras vex. Jail zesty vixen who grabbed pay from quack. The five boxing wizards jump quickly.