python from django.db import models

class Author: name = models.CharField

class Book: title = models.CharField price = models.DecimalField author = models.ForeignKey

lowpricebooks = Book.objects.filter

booktitle = 'Django for beginners' booksby_title = Book.objects.filter

authorname = 'John Smith' booksby_author = Book.objects.filter

bookswithdjango = Book.objects.filter

for book in lowpricebooks: print

for book in booksbytitle: print

for book in bookswithdjango: print