Why info and debug messages are not getting logged?

Question

I copied example from real python, and added two more rows to log also info & debug level messages. However, they never get logged. Do you know what is wrong?

import logging # Create a custom logger logger = logging.getLogger(__name__) # Create handlers c_handler = logging.StreamHandler() f_handler = logging.FileHandler('file.log') c_handler.setLevel(logging.INFO) f_handler.setLevel(logging.DEBUG) # Create formatters and add it to handlers c_format = logging.Formatter('%(name)s - %(levelname)s - %(message)s') f_format = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s') c_handler.setFormatter(c_format) f_handler.setFormatter(f_format) # Add handlers to the logger logger.addHandler(c_handler) logger.addHandler(f_handler) logger.warning('This is a warning') logger.error('This is an error') logger.info('This is info') logger.debug('Just debugging')

This results to a log file with following content, i.e. info and debug messages are missing.

2021-12-07 20:40:16,301 - __main__ - WARNING - This is a warning 2021-12-07 20:40:16,301 - __main__ - ERROR - This is an error

I think this covers the topic pretty comprehensively: stackoverflow.com/questions/17668633/… — Weeble
– Weeble, Commented Dec 7, 2021 at 18:55
Does this answer your question? What is the point of setLevel in a python logging handler? — Weeble
– Weeble, Commented Dec 7, 2021 at 18:57
Thanks @Weeble but actually I don't get the point from it. I do exactlyy as proposed in the first answer there, in my opinion, but got a different answer. Could you point out more clearly what is wrong with my code above? — MattiH
– MattiH, Commented Dec 7, 2021 at 19:06
Your example never sets the root logger's level, only the handlers' levels. The answers in the question I linked explain that it is the root logger's level that needs to be set. — Weeble
– Weeble, Commented Dec 7, 2021 at 19:21
Actually, even if I added the root level with one line of code, the problem persisted. However, it looks like I have now found something else that helps... — MattiH
– MattiH, Commented Dec 7, 2021 at 19:30

MattiH · Accepted Answer · 2021-12-07 19:36:12Z

Now I finally got answer, by applying guidance giving here. I don't know exactly why my approach above doesn't work. However, I know how to make it work. I removed the FileHandler altogether, and added the logging to the file in the basic config like below. Now I get debug level logging into file, and info level logging into the console

import logging f_format = '%(asctime)s - %(name)s - %(levelname)s - %(message)s' logging.basicConfig(level=logging.DEBUG, format=f_format, filename='file.log', filemode='w') # Create a custom logger logger = logging.getLogger(__name__) c_format = logging.Formatter('%(name)s - %(levelname)s - %(message)s') c_handler = logging.StreamHandler() c_handler.setLevel(logging.INFO) c_handler.setFormatter(c_format) logger.addHandler(c_handler) logger.warning('This is a warning') logger.error('This is an error') logger.info('This is info') logger.debug('Just debugging')

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