python logging to file vs console with certain logLevel

Question

import logging import sys logger = logging.getLogger(__name__) logger.setLevel(logging.INFO) file_handler = logging.FileHandler('test.log') file_handler.setLevel(logging.DEBUG) logger.addHandler(file_handler) console_handler = logging.StreamHandler(sys.stdout) console_handler.setLevel(logging.DEBUG) logger.addHandler(console_handler) logger.info('Info print') logger.debug('Debug print')

I have simple code above. How come the debug statement doesn't print? It seems like the logLevel is always determined by line 5. The file_handler.setLevel and the console_handler.setLevel seem to do nothing. I want to eventually have debug prints going to the test.log file, and info prints going to the console.

stdout is sometimes associated with a terminal. Your terminal is almost never a console. Referring to stdout as "console output" is a terrible idea. — William Pursell
– William Pursell, Commented Mar 29, 2022 at 13:40

Vinay Sajip · Accepted Answer · 2022-03-28 20:33:10Z

The logger and handler levels are both used, but at different times. The logger's level is inspected first, and if the event severity level is >= the logger's level, then the event is passed to handlers. The event's level is then checked against each handler's level to determine if that handler handles the event.

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