这种处理 Django 多个设置文件的方法是否合理？

# settings.py
import os
import django

def get_env_variable(var_name):
    """
    Get the environment variable or return default value.
    """
    try:
        return os.environ[var_name]
    except KeyError:
        return django.utils.translation.get_language()

DEBUG = os.getenv('DEBUG', True)
SECRET_KEY = os.getenv('SECRET_KEY', 'your_secret_key')
DATABASE_ENGINE = get_env_variable('DATABASE_ENGINE')
DATABASE_NAME = get_env_variable('DATABASE_NAME')
DATABASE_USER = get_env_variable('DATABASE_USER')
DATABASE_PASSWORD = get_env_variable('DATABASE_PASSWORD')

# Internationalization
LANGUAGE_CODE = 'en-us'
TIME_ZONE = 'UTC'
USE_I18N = True
USE_TZ = True

# Email configuration
EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
EMAIL_HOST = 'your_email_host'
EMAIL_PORT = your_email_port
EMAIL_USE_TLS = False
EMAIL_HOST_USER = 'your_email_username'
EMAIL_HOST_PASSWORD = 'your_email_password'
EMAIL_FROM_ADDRESS = 'your_email_from_address'

# Build paths inside the project like this: BASE_DIR / 'subdir'.
BASE_DIR = os.path.dirname(os.path.abspath(__file__))

AUTH_USER_MODEL = 'users.User'
SECRET_KEY = 'your_secret_key'

DEBUG = True

ALLOWED_HOSTS = ['localhost', '127.0.0.1']

CORS_ORIGIN_WHITELIST = [
    'http://localhost:3000',
    'http://localhost:5000',
]