python log from imported library

Question

I am writing a python library main_lib that relies on another library dep_lib that is installed as dependency.

in both libraries each file starts with :

logger = logging.getLogger(library_name.filename)

and logs are done as:

logger.info("say somthing")

now in my main_lib I have a main method that uses function from both libraries.

I would like logs from both libraries to be printed. How should I configure the log in this main method?

Pretty confused about what you mean, could you provide a minimal working example and also provide the desired output&actual output? Or at least provide what did you get as the output for now? — Sraw
– Sraw, Commented Oct 23, 2019 at 16:02
sorry I have rewritten the question. I can't make minial working example as it requires to create two libraries — Donbeo
– Donbeo, Commented Oct 23, 2019 at 16:16

blues · Accepted Answer · 2019-10-23 19:18:05Z

1

If there is no other code that does something to the logger than they already will print logs to stderr. If no handler is added a handler of last resort will be used, and logs with a level of error or higher will be sent to stderr.

Both handlers and loggers have a setLevel method to set which logs should be handled or ignored. In your case you can fetch the logger in main with logger = logging.getLogger(library_name.filename) and call logger.setLevel(logging.INFO) or whatever level you want on it. You can also add handlers with logger.addHandler(). Also check the documentation.

answered Oct 23, 2019 at 19:18

blues

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