diff --git a/dandiapi/api/doi.py b/dandiapi/api/doi.py
index 9eae5a293..0a549edc4 100644
--- a/dandiapi/api/doi.py
+++ b/dandiapi/api/doi.py
@@ -65,7 +65,7 @@ def delete_doi(doi: str) -> None:
                 r = s.get(doi_url, headers={'Accept': 'application/vnd.api+json'})
                 r.raise_for_status()
             except requests.exceptions.HTTPError as e:
-                if e.response and e.response.status_code == 404:
+                if e.response and e.response.status_code == requests.codes.not_found:
                     logging.warning('Tried to get data for nonexistent DOI %s', doi)
                     return
                 logging.exception('Failed to fetch data for DOI %s', doi)
diff --git a/dandiapi/api/services/metadata/__init__.py b/dandiapi/api/services/metadata/__init__.py
index e7f9b6b20..b6a4c3409 100644
--- a/dandiapi/api/services/metadata/__init__.py
+++ b/dandiapi/api/services/metadata/__init__.py
@@ -88,13 +88,13 @@ def version_aggregate_assets_summary(version: Version) -> None:
         .iterator()
     )
 
-    updated_metadata = {**version.metadata, **{'assetsSummary': assets_summary}}
+    updated_metadata = {**version.metadata, 'assetsSummary': assets_summary}
 
     updated_count = Version.objects.filter(id=version.id, metadata=version.metadata).update(
         modified=timezone.now(), metadata=updated_metadata
     )
     if updated_count == 0:
-        logger.info(f'Skipped updating assetsSummary for version {version.id}')
+        logger.info('Skipped updating assetsSummary for version %s', version.id)
 
 
 def validate_version_metadata(*, version: Version) -> None:
diff --git a/dandiapi/api/tests/test_dandiset.py b/dandiapi/api/tests/test_dandiset.py
index 9952826c3..b75ba378a 100644
--- a/dandiapi/api/tests/test_dandiset.py
+++ b/dandiapi/api/tests/test_dandiset.py
@@ -342,11 +342,11 @@ def test_dandiset_rest_create(api_client, user):
         },
         'most_recent_published_version': None,
     }
-    id = int(response.data['identifier'])
+    dandiset_id = int(response.data['identifier'])
 
     # Creating a Dandiset has side affects.
     # Verify that the user is the only owner.
-    dandiset = Dandiset.objects.get(id=id)
+    dandiset = Dandiset.objects.get(id=dandiset_id)
     assert list(dandiset.owners.all()) == [user]
 
     # Verify that a draft Version and VersionMetadata were also created.
@@ -632,11 +632,11 @@ def test_dandiset_rest_create_embargoed(api_client, user):
         },
         'most_recent_published_version': None,
     }
-    id = int(response.data['identifier'])
+    dandiset_id = int(response.data['identifier'])
 
     # Creating a Dandiset has side affects.
     # Verify that the user is the only owner.
-    dandiset = Dandiset.objects.get(id=id)
+    dandiset = Dandiset.objects.get(id=dandiset_id)
     assert list(dandiset.owners.all()) == [user]
 
     # Verify that a draft Version and VersionMetadata were also created.
diff --git a/dandiapi/api/views/dandiset.py b/dandiapi/api/views/dandiset.py
index c035e3572..1a83c7e47 100644
--- a/dandiapi/api/views/dandiset.py
+++ b/dandiapi/api/views/dandiset.py
@@ -236,9 +236,9 @@ def search(self, request, *args, **kwargs):
             .filter(dandiset_id__in=[dandiset.id for dandiset in dandisets])
             .annotate(
                 **{
-                    filter_name: Count('asset_id', filter=filter)
-                    for filter_name, filter in query_filters.items()
-                    if filter != Q()
+                    query_filter_name: Count('asset_id', filter=query_filter_q)
+                    for query_filter_name, query_filter_q in query_filters.items()
+                    if query_filter_q != Q()
                 }
             )
         )
diff --git a/scripts/delete_from_versioned_bucket.py b/scripts/delete_from_versioned_bucket.py
index 4266d1f14..e6595e80b 100644
--- a/scripts/delete_from_versioned_bucket.py
+++ b/scripts/delete_from_versioned_bucket.py
@@ -16,6 +16,8 @@
 import boto3
 import click
 
+WARN_THRESHOLD = 1000
+
 
 def delete_version(bucket, thing):
     key = thing['Key']
@@ -43,7 +45,7 @@ def delete_objects(*, profile: str, bucket: str, prefix: str, force: bool, threa
     delete_markers = response.get('DeleteMarkers', [])
     versions = response.get('Versions', [])
     delete_count = len(delete_markers) + len(versions)
-    if delete_count >= 1000:
+    if delete_count >= WARN_THRESHOLD:
         click.echo('There are more than 1000 objects to delete.')
         click.echo('This operation will continue to fetch objects until they are all deleted.')
     if force or click.confirm(f'Delete {delete_count} objects from {bucket.name}/{prefix}?'):