manage.py

#!/usr/bin/env python
"""Django's command-line utility for administrative tasks."""
import os
import sys

STAGE = {
    'dev': 'config.settings.development',  # Development
    'prod': 'config.settings.production'  # Production
}
stage_state = os.environ.get('STAGE_STATE','dev')
SETTINGS = STAGE[stage_state]

def main():
    """Run administrative tasks."""
    os.environ.setdefault('DJANGO_SETTINGS_MODULE', SETTINGS)
    try:
        from django.core.management import execute_from_command_line
    except ImportError as exc:
        raise ImportError(
            "Couldn't import Django. Are you sure it's installed and "
            "available on your PYTHONPATH environment variable? Did you "
            "forget to activate a virtual environment?"
        ) from exc
    execute_from_command_line(sys.argv)


if __name__ == '__main__':
    main()