How do I activate database settings from my settings.py DATABASES array based on environment?

How do I activate database settings from my settings.py DATABASES array based on environment?

I'm using Django with Python 3.7. I have a settings.py file, which includes some database settings ...

I'm using Django with Python 3.7. I have a settings.py file, which includes some database settings ...

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': 'mainpage',
        'USER': 'mainpage',
        'PASSWORD': 'password',
        'HOST': 'localhost',
        'PORT': '5432'
    },
    'production': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': 'mainpage',
        'USER': 'mainpage',
        'PASSWORD': 'password',
        'HOST': 'localhost',
        'PORT': '5432'
    }
}

The file includes a bunch of other things but I have only included the database array here. Is it possible to activate a particular database configuration from my array based on my environment or an environment variable? I would prefer not to have multiple settings files because then I have to repeat a lot of other configurations in them that do not change across environment. I'm happy to move the database settings to their own files if that's what it takes but I'm not sure how they would be activated.

python django database

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