Python logger not working when I run package through __main__.py

I have a python package that I use for data preprocessing which I usually run through a Makefile. I want to run it like so: python3 -m utils.features, so that’s why I created __main__.py. However, if I run it like this (instead of python3 -m utils.features.build_features) all the loggers stop producing output, both defined in this file and from other modules imported in build_features.py. Why does this happen?

My project structure:

utils/
├─ features/
│  ├─ __init__.py
│  ├─ __main__.py
│  ├─ build_features.py

__init__.py:

__main__.py:

from .build_features import build_features

build_features()

build_features.py:

imports...

def build_features():
    logger = logging.getLogger(__name__)
    logger.info("Reading data")
    ...

    logger.info("Building features")
    ...

    logger.info("Saving data")
    ...


if __name__ == "__main__":
    log_fmt = "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
    logging.basicConfig(level=logging.INFO, format=log_fmt)

    # find .env automagically by walking up directories until it's found, then
    # load up the .env entries as environment variables
    load_dotenv(find_dotenv())

    build_features()

>Solution :

That’s because you setup your loggers in the if __name__ == "__main__" of build_features.py.

Move the logger setup to __main__.py and it’ll work.