Python: question about the loggind module with TimedRotatingFileHandler

Question

Backgroud: I try to use the loggind module to record my log.

I use TimedRotatingFileHandler and set the date suffix %Y-%m-%d_%H-%M to each log file. However, I noticed that the first log file that be generated by the logging module didn't append the suffix to its file name, how can I fix it or it is inevitable?

Answer 1

It is simply the name of the current file in which the logger is writing. The others are the previous.
Here is my code:

import logging
import time
from logging import handlers

root_logger = logging.getLogger()
root_logger.addHandler(handlers.TimedRotatingFileHandler("log", when="s"))

for i in range(10):
    root_logger.warning(i)
    time.sleep(0.3)

It produced:

• log.2022-01-27_17-37-33

   0

• log.2022-01-27_17-37-34

   1 2 3 4

• log.2022-01-27_17-37-35

   5 6 7 8

• log

   9

When run again, it renamed log to log.2022-01-27_17-37-36 and produced another 4 files, three with a date and the last without.