Default options (django-admin and manage.py)

--pythonpath PYTHONPATH

If this isn’t provided, django-admin will use the PYTHONPATH environment variable.

This option is unnecessary in manage.py, because it takes care of setting the Python path for you.

--settings SETTINGS

Pythonパッケージのsyntax（ドットつなぎ）でsettingsモジュールを指定する

If this isn’t provided, django-admin will use the DJANGO_SETTINGS_MODULE environment variable.

This option is unnecessary in manage.py, because it uses settings.py from the current project by default.