Relating column to fields in model about django-import-export HOT 11 CLOSED

class Contact(models.Model):
    name = models.CharField(max_length=64, )
    description = models.TextField(blank=True, null=True,)
    pic = RemovableImageField(blank=True, null=True, upload_to=settings.UPLOAD_DIR,)
    address = models.TextField(blank=True, null=True,)
    telephone = models.CharField(max_length=256, help_text="Separate multiple telephone numbers with a '/'", blank=True, null=True,)
    fax = models.CharField(max_length=256, help_text="Separate multiple fax numbers with a '/'", blank=True, null=True,)
    email = models.EmailField(max_length=256, blank=True, null=True,)
    website = models.URLField(max_length=256, blank=True, null=True,)
    sortorder = models.IntegerField(db_index=True, blank=True, null=True,)
    path = models.SlugField(max_length=64, default='',)

    class Meta:
        abstract = True

    name=Name+Surname
    id=Bd/Sr
    sortorder=Br/Sr
    telephone = Tel
    level = if Slv/Gld='Sil': return 1 elif Slv/Gld='Gld': return 2 else: return 3

#resources.py
from import_export import fields, resources

class ContactResource(resources.ModelResource):
    # override id it is exact mapping
    id = fields.Field(column_name='Bd/Sr', attribute="id")

    class Meta:
        model = Contact

    def import_obj(instance, row):
        super(ContactResource, self).import_obj(instance, row)
        instance.name = "%s %s" % (row['Name'], row['Surname'])
        if row['Slv/Gld'] == 'Sil':
            instance.level = 1
            # and so on


#admin.py
from resources import ContactResource

class ContactAdmin(ImportExportModelAdmin):
    resource_class = ContactResource
    # ...

class BookResource(resources.ModelResource):
    id = fields.Field(column_name='Bd/Sr', attribute="id") 

    class Meta:
        model = Book

    def import_obj(instance, row):
        super(ContactResource, self).import_obj(instance, row)
        instance.name = "%s %s" % (row['Name'], row['Surname'])
        if row['Slv/Gld'] == 'SIL':
            instance.price = 1
        elif row['Slv/Gld'] == 'GLD':
            instance.price = 2
        else:
            instance.price = 3

Errors

    Line number: 1 - TypeError('import_obj() takes exactly 2 arguments (3 given)',)

    Traceback (most recent call last):
    File "../import_export/resources.py", line 271, in import_data
    self.import_obj(instance, row)
    TypeError: import_obj() takes exactly 2 arguments (3 given)