Configure Python logging

logger.py

import logging

INFO = logging.INFO
DEBUG = logging.DEBUG
WARNING = logging.WARNING


def create_logger(logger_name, log_level=logging.WARNING, filename=None):
    """ Create a logger that log to the console, if a filename is
    supplied, log to that file as well.
    """
    logger = logging.getLogger(logger_name)
    logger.setLevel(log_level)

    # create console handler and set appropriate level
    ch = logging.StreamHandler()
    formatter = logging.Formatter("%(message)s")
    ch.setFormatter(formatter)
    logger.addHandler(ch)

    # Create a file handler and set appropriate level
    if filename:
        fh = logging.FileHandler(filename=filename, mode='w')
        fformatter = logging.Formatter(
            '%(asctime)s;%(filename)s;%(lineno)d;%(levelname)s;%(message)s',
            "%Y-%m-%d %H:%M:%S")
        fh.setFormatter(fformatter)
        logger.addHandler(fh)
    return logger

logging.ini

[loggers]
keys=root,sample

[handlers]
keys=console

[formatters]
keys=default

[logger_root]
level=WARNING
handlers=console

[logger_sample]
level=DEBUG
handlers=console
qualname=sample
propagate=0

[handler_console]
class=StreamHandler
level=DEBUG
formatter=default
args=(sys.stdout,)

[formatter_default]
format=[%(asctime)s] %(levelname)s %(name)s: %(message)s
datefmt=%Y-%m-%d %H:%M:%S

pyproject.toml

#
# Add this section to pyproject.toml to configure pytest logging
#

[tool.pytest.ini_options]
log_cli = true
log_cli_level = "DEBUG"
log_cli_format = "%(levelname)-8s | %(name)s:%(message)s"
log_cli_date_format = "%Y-%m-%d %H:%M:%S"
log_file = "pytest.log"
log_file_level = "DEBUG"
log_file_format = "%(levelname)-8s | %(name)s:%(message)s"
log_file_date_format = "%Y-%m-%d %H:%M:%S"