diff --git a/kobo/apps/openrosa/apps/logger/tests/test_form_submission.py b/kobo/apps/openrosa/apps/logger/tests/test_form_submission.py
index b7c63fc71d..78fd0b9a88 100644
--- a/kobo/apps/openrosa/apps/logger/tests/test_form_submission.py
+++ b/kobo/apps/openrosa/apps/logger/tests/test_form_submission.py
@@ -307,7 +307,8 @@ def test_duplicate_submission_with_same_content_but_with_different_attachment(se
         )
         media_file_path2 = os.path.join(
             os.path.dirname(__file__),
-            '../fixtures/tutorial/instances/tutorial_with_attachment/attachment_with_different_content',
+            '../fixtures/tutorial/instances/tutorial_with_attachment/'
+            'attachment_with_different_content',
             '1335783522563.jpg',
         )
         initial_instance_count = Instance.objects.count()
@@ -336,7 +337,8 @@ def test_duplicate_submission_with_same_content_but_with_different_attachment(se
             Attachment.objects.filter(instance=initial_instance).count(), 1
         )
 
-        # Test duplicate submission with same attachment (different file name)
+        # Test duplicate submission with same attachment name but with
+        # different content
         with open(media_file_path2, 'rb') as media_file2:
             self._make_submission(xml_submission_file_path, media_file=media_file2)
         self.assertEqual(self.response.status_code, 202)
diff --git a/kobo/apps/openrosa/libs/tests/mixins/make_submission_mixin.py b/kobo/apps/openrosa/libs/tests/mixins/make_submission_mixin.py
index 80e7f219ca..5be84a5640 100644
--- a/kobo/apps/openrosa/libs/tests/mixins/make_submission_mixin.py
+++ b/kobo/apps/openrosa/libs/tests/mixins/make_submission_mixin.py
@@ -55,9 +55,9 @@ def _add_submission_uuid_to_submission_xml(self, path):
 
         # Insert the meta element before the closing tag of the root element
         xml_content = (
-            xml_content[:closing_tag_index] +
-            meta_element +
-            xml_content[closing_tag_index:]
+            xml_content[:closing_tag_index]
+            + meta_element
+            + xml_content[closing_tag_index:]
         )
 
         # Write the updated XML content to a temporary file and return the path
diff --git a/kobo/apps/openrosa/libs/utils/logger_tools.py b/kobo/apps/openrosa/libs/utils/logger_tools.py
index c148d2d872..f135091046 100644
--- a/kobo/apps/openrosa/libs/utils/logger_tools.py
+++ b/kobo/apps/openrosa/libs/utils/logger_tools.py
@@ -51,7 +51,6 @@
 from kobo.apps.openrosa.apps.logger.models import Attachment, Instance, XForm
 from kobo.apps.openrosa.apps.logger.models.attachment import (
     generate_attachment_filename,
-    hash_attachment_contents,
 )
 from kobo.apps.openrosa.apps.logger.models.instance import (
     InstanceHistory,
diff --git a/kpi/tests/api/v2/test_api_submissions.py b/kpi/tests/api/v2/test_api_submissions.py
index d2c91c9844..87edaa52bb 100644
--- a/kpi/tests/api/v2/test_api_submissions.py
+++ b/kpi/tests/api/v2/test_api_submissions.py
@@ -1596,8 +1596,8 @@ def test_edit_submission_with_xml_missing_uuids(self):
         assert submission_json['_id'] == submission['_id']
         assert submission_xml_root.find('./find_this').text == 'hello!'
         assert (
-            submission_xml_root.find('./meta/instanceID').text
-            == 'uuid:9710c729-00a5-41f1-b740-8dd618bb4a49'
+            submission_xml_root.find('./meta/instanceID').text ==
+            'uuid:9710c729-00a5-41f1-b740-8dd618bb4a49'
         )
         assert submission_xml_root.find('./formhub/uuid') is None