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Reputation: 20658

Python logger formatting not appearing when output to file

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?

Upvotes: 1

Views: 472

Answers (1)

PeterK
PeterK

Reputation: 1243

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')

Upvotes: 1

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