Python Logging - Set Date as Filename

Perhaps you can use Python's TimedRotatingFileHandler instead. You can set the interval to create a new log file every day with the date as the suffix.

Documentation--

• Python 2: https://docs.python.org/2/library/logging.handlers.html#timedrotatingfilehandler
• Python 3: https://docs.python.org/3/library/logging.handlers.html#timedrotatingfilehandler

Note that the current day's log file won't have a date. This file handler only adds the date suffix when a new day starts.

Also, the suffix it uses is "%Y-%m-%d", which is a little different than what you want. But there's a SO question here about how you can alter that.

You can't use datetime in a config file, as it doesn't know what it means. You can however add the Filehandler in the python file itself:

import logging.config
from datetime import datetime

logging.config.fileConfig('aaa.conf')
logger = logging.getLogger('MainLogger')

fh = logging.FileHandler('{:%Y-%m-%d}.log'.format(datetime.now()))
formatter = logging.Formatter('%(asctime)s | %(levelname)-8s | %(lineno)04d | %(message)s')
fh.setFormatter(formatter)

logger.addHandler(fh)
logger.debug("TEST")

This way you can set the date as the file name in the handler.

This is the config file, note that you had a typo in the last formatter, you put fillname instead of filename and you forgot ( in message.

[loggers]
keys=root,MainLogger

[handlers]
keys=consoleHandler

[formatters]
keys=consoleFormatter

[logger_root]
level=DEBUG
handlers=consoleHandler

[logger_MainLogger]
level=DEBUG
handlers=consoleHandler
qualname=MainLogger
propagate=0

[handler_consoleHandler]
class=StreamHandler
level=DEBUG
formatter=consoleFormatter
args=(sys.stdout,)

[formatter_consoleFormatter]
format=%(asctime)s | %(levelname)-8s | %(filename)s-%(funcName)s-%(lineno)04d | %(message)s

This Should work just fine.

This worked for me.

Update this,

args=(datetime.now().strftime('%Y_%m_%d.log'), 'a')

with this,

args=(\__import__("datetime").datetime.now().strftime('%Y_%m_%d.log'), 'a')

Reference (Example no 3): http://python-reference.readthedocs.io/en/latest/docs/functions/eval.html