python3 manage.py runserver
createdb <dbname>
python3 manage.py makemigrations
python3 manage.py migrate
django-admin startproject <projectname>
python3 manage.py startapp main_app
python3 manage.py shell
from main_app.models import *
c = Cat.objects.get(id=3)
Cat.objects.all()
Cat.objects.first()