Python logging module always uses the same file

Question

I have two logging classes, that should print logs on two different files.

First class

import logging

class firstLog:
    
    def __init__(self):
        self.logger = logging.getLogger("my_logger1")
        logging.basicConfig(format="%(asctime)s.%(msecs)06d:\n%(message)s\n", level=logging.DEBUG,
                            datefmt="%d/%m/%Y %H:%M:%S",
                            filename="filename1.log")

    def printlog(self, msg, *args, **kwargs):
        self.logger.debug(msg, *args, **kwargs)

Second class

import logging

class secondLog:
    
    def __init__(self):
        self.logger = logging.getLogger("my_logger2")
        logging.basicConfig(format="%(asctime)s.%(msecs)06d:\n%(message)s\n", level=logging.DEBUG,
                            datefmt="%d/%m/%Y %H:%M:%S",
                            filename="filename2.log")

    def printlog(self, msg, *args, **kwargs):
        self.logger.debug(msg, *args, **kwargs)

I instantiate the two classes, but only filename1.log is written

log1 = firstLog()
log2 = secondLog()

log1.printlog("text1")
log2.printlog("text2")

What I obtain is that a new file, called filename1.log is created, and contains

04/06/2021 08:57:04.000988:
text1
04/06/2021 08:57:04.000990:
text2

but I need two separate files

Klaus D. · Accepted Answer · 2021-06-04 07:22:49Z

4

logging.basicConfig() is only applied once.

If logging has been configured already, basicConfig() will do nothing unless force is set. (source)

In your case you should get separate loggers with logging.getLogger(name) and different names. Then configure the loggers manually.

answered Jun 4, 2021 at 7:22

Klaus D.

14.5k5 gold badges44 silver badges53 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Klaus D. Over a year ago

You should have a look at the How-to. It explains a lot about the concepts of the logging package and how to configure it. You will also see way many developers use getLogger(__name__) instead of creating loggers manually.

AKX · Accepted Answer · 2021-06-04 07:22:49Z

1

logging.basicConfig() is meant to be run once at your app's startup time, and will configure the root logger.

You will need to configure the two other loggers manually if you need their output to go elsewhere (or maybe configure a "routing" handler on the root logger).

answered Jun 4, 2021 at 7:22

AKX

171k16 gold badges147 silver badges229 bronze badges

Collectives™ on Stack Overflow

Python logging module always uses the same file

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related