diff --git a/openlibrary/core/models.py b/openlibrary/core/models.py
index fd0f7e791b23..4dbe3f32cc60 100644
--- a/openlibrary/core/models.py
+++ b/openlibrary/core/models.py
@@ -1,7 +1,6 @@
 """Models of various OL objects.
 """
 
-import json
 import logging
 from collections import defaultdict
 from dataclasses import dataclass, field
diff --git a/openlibrary/plugins/upstream/addtag.py b/openlibrary/plugins/upstream/addtag.py
index 7f6e2fc30a95..6f3326558c5b 100644
--- a/openlibrary/plugins/upstream/addtag.py
+++ b/openlibrary/plugins/upstream/addtag.py
@@ -8,7 +8,6 @@
 from infogami.infobase.client import ClientException
 from infogami.utils import delegate
 from infogami.utils.view import add_flash_message, public
-
 from openlibrary.accounts import get_current_user
 from openlibrary.plugins.upstream import spamcheck
 from openlibrary.plugins.upstream.addbook import safe_seeother, trim_doc
@@ -227,7 +226,7 @@ def POST(self, tag_type):
                 "message.html", "Oops", 'Something went wrong. Please try again later.'
             )
         if not (patron := get_current_user()):
-            raise web.seeother(f'/account/login')
+            raise web.seeother('/account/login')
         if not self.has_permission(patron):
             raise web.unauthorized()
 
diff --git a/openlibrary/plugins/worksearch/subjects.py b/openlibrary/plugins/worksearch/subjects.py
index bebe180ca6e5..2ffe900143c3 100644
--- a/openlibrary/plugins/worksearch/subjects.py
+++ b/openlibrary/plugins/worksearch/subjects.py
@@ -11,7 +11,6 @@
 from infogami.plugins.api.code import jsonapi
 from infogami.utils import delegate
 from infogami.utils.view import render_template, safeint
-
 from openlibrary.core.lending import add_availability
 from openlibrary.core.models import Subject, Tag
 from openlibrary.solr.query_utils import query_dict_to_str