Learning logging module: INFO message not displayed

Python Help
1

Hi,
I am learning how to use the logging module.

Here the desired design:
Inside main.py file a customized logger is created, for instance:

import logging
import logging.handlers
from mypath.myprogram import program_run

def logging_setup():
    class CustomFormatter(logging.Formatter):
        grey = "\x1b[38;21m"
        yellow = "\x1b[33;21m"
        red = "\x1b[31;21m"
        blue = "\x1b[34;21m"
        bold_red = "\x1b[31;1m"
        reset = "\x1b[0m"
        format_info = "[%(levelname)s - %(asctime)s]: "
        format_message = "%(message)s"

        FORMATS = {
            logging.DEBUG: grey + format_info + reset + format_message,
            logging.INFO: blue + format_info + reset + format_message,
            logging.WARNING: yellow + format_info + reset + format_message,
            logging.ERROR: red + format_info + reset + format_message,
            logging.CRITICAL: bold_red + format_info + reset + format_message
        }

        def format(self, record):
            log_fmt = self.FORMATS.get(record.levelno)
            formatter = logging.Formatter(log_fmt, datefmt='%Y-%m-%d %H:%M:%S')
            return formatter.format(record)

    # Create custom formatter
    custom_formatter = CustomFormatter()

    # Configure the root logger named app
    custom_logger = logging.getLogger('app')

    # set up the console handler
    console_handler = logging.StreamHandler()
    console_handler.setLevel(logging.INFO)
    console_handler.setFormatter(custom_formatter)

    # add handlers
    custom_logger.addHandler(console_handler)

if __name__ == '__main__':
    # set up logging
    logging_setup()
    # get logger
    logger = logging.getLogger('app')
    # test logger
    logger.info('information message') # this is not printed
    logger.error('error message') # this is printed
    # test the logger inside another file
    program_run()

Then inside the other file mypath/myprogram.py:

import logging
def program_run():
    logger = logging.getLogger('app')
    logger.info('information in another file') # this is not printed
    logger.error('error in another file') # this is printed

The problem is that the INFO level messages are not displayed, am I missing something?

2

I get, in Python 3.10.12,

> python main.py
[ERROR - 2023-08-30 10:24:53]: error message
[ERROR - 2023-08-30 10:24:53]: error in another file
3

The default logger log level is WARNING. Try adding logger.setLevel(logging.INFO).
If you want that as general default, then you could also add it to your initialization function.

2 Likes
4

Thank you, I did not notice that I could set the level for both loggers and handlers :face_in_clouds:

5

FYI the 0 is not required. You can use “\x1b[m”.

The 0m has been cargo culted for years.

1 Like