config files for different development environments (Production, Dev, Testing)

I am following a guide that specifies how to manage different configurations (DB_URI, LOGGER_NAME, etc…) per development environments.

I create a config module that is structured like this

my_projectconfig__init__.py

import os
import sys
from . import settings

# create settings object corresponding to specified env
APP_ENV = os.environ.get('APP_ENV', 'Dev')
_current_config = vars(setting).get(f'{APP_ENV}Config')

# copy attributes to the module for convenience
for atr in [f for f in dir(_current_config) if '__' not in f]:
    # environment can override anything
    val = os.environ.get(atr, getattr(_current_config, atr))
    setattr(sys.modules[__name__], atr, val)

my_projectconfigsettings.py

class BaseConfig:
    DEBUG = True
    LOGGER_NAME = 'my_app'


class DevConfig(BaseConfig):
    # In actuality calling a function that fetches a secret 
    SQLALCHEMY_DATABASE_URI = 'sqlite://user.db'


class ProductionConfig(BaseConfig):
    DEBUG = False
    # In actuality calling a function that fetches a secret
    SQLALCHEMY_DATABASE_URI = 'sqlite://user.db'

calling the config

application.py

import config
config.SQLALCHEMY_DATABASE_URI 

This approach is kind of a hit and miss for me.
on one hand it allows me to easily specify several environments (dev, stage, prod, dev) without having a complex if else logic in my settings.py.

On the other hand I dont like using setattr on sys.modules[__name__], seems a bit wonky to me. what do you think ?