Python logger formatting not appearing when output to file

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I've set my Python program to log output, but although it logs correctly to the console, it does not log the time, log level information etc to the file.

Program:

import time
import logging
from logging.handlers import RotatingFileHandler

logFileName = 'logs.log'
logging.basicConfig(level=logging.INFO, format='%(levelname)s %(asctime)s - %(message)s', datefmt='%d-%b-%y %H:%M:%S')
log = logging.getLogger(__name__)
handler = RotatingFileHandler(logFileName , maxBytes=2000 , backupCount=5)
log.addHandler(handler)
log.setLevel(logging.INFO)

if __name__ == '__main__':
    while True:
        log.info("program running")
        time.sleep(1)

Output to console:

INFO 05-May-22 23:20:54 - program running
INFO 05-May-22 23:20:55 - program running
INFO 05-May-22 23:20:56 - program running
INFO 05-May-22 23:20:57 - program running
INFO 05-May-22 23:20:58 - program running
INFO 05-May-22 23:20:59 - program running
INFO 05-May-22 23:21:00 - program running

Simultaneous output to file logs.log:

program running
program running
program running
program running
program running
program running
program running

How to make the full output go to the log file?

logging python
1 Answers

You can separately set the Formatter for the RotatingFileHandler

handler.formatter = logging.Formatter(fmt='%(levelname)s %(asctime)s - %(message)s', datefmt='%d-%b-%y %H:%M:%S')
user_25411380
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