python logging config format

Question

I am using the python logging module with a configuration file. It is working but I would like to change the format of the output string. Currently in the config file I have a line

[formatter_fileFormatter]
format=[%(asctime)s] %(levelname)-8s %(name)-12s %(message)s 

which gives me output like this

[2022-12-14 11:21:50,247] INFO my_logger.mod1 This is an info log message from func1

I would like to remove the decimal seconds. How can I do it? Ideally I would like to use the f string method of formatting, which I have read is possible but cannot find an explanation anywhere which explains how.

Answer 1

To remove the decimal seconds you could try specifying a different time format in the format string for the formatter like shown below. This will use the datefmt parameter to specify the format of the time:

format=[%(asctime)s] %(levelname)-8s %(name)-12s %(message)s
datefmt=%Y-%m-%d %H:%M:%S

If you wish to use the f-string approach you could try something like this:

[formatter_fileFormatter]
class=logging.Formatter
format=f'[{asctime}] {levelname:8} {name:12} {message}'
datefmt=%Y-%m-%d %H:%M:%S

This will create a formatter using the logging.Formatter class and specify an f-string format string.