class Person(models.Model):
    isMale = models.BooleanField(default=True)
    name = models.CharField(max_length=32)
    age = models.IntegerField()
    mail = models.CharField(max_length=64)
    phone = models.CharField(max_length=32)
    class Meta:
        abstract = True

    def __str(self):
        return self.name


class User(Person):
    username = models.CharField(max_length=64)
    password = models.CharField(max_length=64)
    department = models.CharField(max_length=64)
    date_joined = models.DateField()

    class Meta:
        abstract = False
    def __str(self):
        return self.department + "'s " + self.name

python manage.py makemigrations
   python manage.py migrate

migrations.CreateModel(
            name='User',
            fields=[
                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                ('isMale', models.BooleanField(default=True)),
                ('name', models.CharField(max_length=32)),
                ('age', models.IntegerField()),
                ('mail', models.CharField(max_length=64)),
                ('phone', models.CharField(max_length=32)),
                ('address', models.CharField(max_length=32)),
                ('username', models.CharField(max_length=64)),
                ('password', models.CharField(max_length=64)),
                ('department', models.CharField(max_length=64)),
                ('date_joined', models.DateField()),
            ],
            options={
                'abstract': False,
            },
        ),


class Meta:
    abstract = True

p = User(username="",password="",department="",isMale=True,name="",age=1,mail="",phone="",date_joined=timezone.now())
 p.save()