Virtualenv postactivate and postdeactivate files for django.
Place these files at $VIRTUAL_ENV/bin. That is inside the bin folder inside the virtualenv directory.
Because it quickly gets problematic to type python manage.py <command> in the terminal. It’s even more difficult if your project uses multiple manage.py files. It’s also quite convenient to not have to type the whole python manage.py schemamigration <app_name> --auto everytime.