What is the best way to allow user to configure a Python package

Question

I have situation like this. I am creating a Python package. That Python package needs to use Redis, so I want to allow the user of the package to define the Redis url.

Here's how I attempted to do it:

bin/main.py

from my_package.main import run
from my_package.config import config

basicConfig(filename='logs.log', level=DEBUG)
# the user defines the redis url
config['redis_url'] = 'redis://localhost:6379/0'
run()

my_package/config.py

config = {
    "redis_url": None
}

my_package/main.py

from .config import config

def run():
    print(config["redis_url"])  # prints None instead of what I want

Unfortunately, it doesn't work. In main.py the value of config["redis_url"] is None instead of the url defined in bin/main.py file. Why is that? How can I make it work?

I could pass the config to the run() function, but then if I run some other function I will need to pass the config to that function as well. I'd like to pass it one time ideally.