A.len(Value)B.Value.lenghtC.Value.lenght()D.lenght(Value)
A.remove()方法B.insert()方法C.pop()方法D.append()方法
A.models.Book.objects.all()B.models.Book.objects.get(id=3)C.models.Book..objects.filter(book_name=’python’)D.models.Book.objects.create(full_name=’lsw’)