the fullname property hasn t provided a set method and cannot be used to initialize the class but fullname2 has and it can be used to initialize the class the full_name property hasn t provided a set method and cannot be used to initialize the class but full_name_2 has and it can be used to initialize the class
from django.test import TestCase

from .models import Person


class PropertyTests(TestCase):
    @classmethod
    def setUpTestData(cls):
        cls.a = Person.objects.create(first_name="John", last_name="Lennon")

    def test_getter(self):
        self.assertEqual(self.a.full_name, "John Lennon")

    def test_setter(self):
        
        with self.assertRaises(AttributeError):
            setattr(self.a, "full_name", "Paul McCartney")

        
        with self.assertRaises(AttributeError):
            Person(full_name="Paul McCartney")

        
        a2 = Person(full_name_2="Paul McCartney")
        a2.save()
        self.assertEqual(a2.first_name, "Paul")