How to use the graphene-django.examples.starwars.models.Faction function in graphene-django

def initialize():
    human = Character(
        name='Human'
    )
    human.save()

    droid = Character(
        name='Droid'
    )
    droid.save()

    rebels = Faction(
        id='1',
        name='Alliance to Restore the Republic',
        hero=human
    )
    rebels.save()

    empire = Faction(
        id='2',
        name='Galactic Empire',
        hero=droid
    )
    empire.save()

    xwing = Ship(
        id='1',
        name='X-Wing',

)
    human.save()

    droid = Character(
        name='Droid'
    )
    droid.save()

    rebels = Faction(
        id='1',
        name='Alliance to Restore the Republic',
        hero=human
    )
    rebels.save()

    empire = Faction(
        id='2',
        name='Galactic Empire',
        hero=droid
    )
    empire.save()

    xwing = Ship(
        id='1',
        name='X-Wing',
        faction=rebels,
    )
    xwing.save()

    ywing = Ship(
        id='2',
        name='Y-Wing',

def __str__(self):
        return self.name


class Faction(models.Model):
    name = models.CharField(max_length=50)
    hero = models.ForeignKey(Character)

    def __str__(self):
        return self.name


class Ship(models.Model):
    name = models.CharField(max_length=50)
    faction = models.ForeignKey(Faction, related_name='ships')

    def __str__(self):
        return self.name