diff --git a/src/pretix/api/serializers/item.py b/src/pretix/api/serializers/item.py
index 96ba8a4fa8..053481014f 100644
--- a/src/pretix/api/serializers/item.py
+++ b/src/pretix/api/serializers/item.py
@@ -459,7 +459,6 @@ class ItemCategorySerializer(I18nAwareModelSerializer):
         return data
 
 
-
 class QuestionOptionSerializer(I18nAwareModelSerializer):
     identifier = serializers.CharField(allow_null=True)
 
diff --git a/src/pretix/base/services/cross_selling.py b/src/pretix/base/services/cross_selling.py
index ff617c75de..4ca8e3b1e9 100644
--- a/src/pretix/base/services/cross_selling.py
+++ b/src/pretix/base/services/cross_selling.py
@@ -96,7 +96,7 @@ class CrossSellingService:
             match = set(match.pk for match in category.cross_selling_match_products.only('pk'))  # TODO prefetch this
             return (category.items.all(), {}) if any(pos.item.pk in match for pos in self.cartpositions) else (None, {})
         if category.cross_selling_condition == 'discounts':
-            my_item_pks = [item.id for item in category.items.all()]  #category.items.values_list('pk', flat=True)
+            my_item_pks = [item.id for item in category.items.all()]
             potential_discount_items = {
                 item.pk: (max_count, discount_rule)
                 for item, max_count, discount_rule in self._potential_discounts_by_item_for_current_cart
diff --git a/src/pretix/control/forms/item.py b/src/pretix/control/forms/item.py
index 75634e3240..ce8dc9f7fc 100644
--- a/src/pretix/control/forms/item.py
+++ b/src/pretix/control/forms/item.py
@@ -40,7 +40,6 @@ from urllib.parse import urlencode
 from django import forms
 from django.conf import settings
 from django.core.exceptions import ValidationError
-from django.core.files.uploadedfile import UploadedFile
 from django.db.models import Max, Q
 from django.forms import ChoiceField, RadioSelect
 from django.forms.formsets import DELETION_FIELD_NAME
diff --git a/src/tests/base/test_cross_selling.py b/src/tests/base/test_cross_selling.py
index 7a557d52aa..3ff774d6a4 100644
--- a/src/tests/base/test_cross_selling.py
+++ b/src/tests/base/test_cross_selling.py
@@ -27,10 +27,10 @@ from typing import List, Tuple
 import pytest
 from django.utils.timezone import now
 from django_scopes import scopes_disabled
+from tests import assert_num_queries
 
 from pretix.base.models import CartPosition, Discount, Event, Organizer
 from pretix.base.services.cross_selling import CrossSellingService
-from tests import assert_num_queries
 
 
 @pytest.fixture
@@ -467,6 +467,7 @@ def test_five_tickets_one_free(event):
         '''
     )
 
+
 @scopes_disabled()
 @pytest.mark.django_db
 @pytest.mark.parametrize("itemcount", [3, 10, 50])