diff --git a/bookwyrm/models/shelf.py b/bookwyrm/models/shelf.py
index b1b99fac1..d955e8d07 100644
--- a/bookwyrm/models/shelf.py
+++ b/bookwyrm/models/shelf.py
@@ -104,18 +104,24 @@ class ShelfBook(CollectionItemMixin, BookWyrmModel):
             self.user = self.shelf.user
         if self.id and self.user.local:
             # remove all caches related to all editions of this book
-            cache.delete_many([
-                f"book-on-shelf-{book.id}-{self.shelf.id}"
-                for book in self.book.parent_work.editions.all()
-            ])
+            cache.delete_many(
+                [
+                    f"book-on-shelf-{book.id}-{self.shelf.id}"
+                    for book in self.book.parent_work.editions.all()
+                ]
+            )
         super().save(*args, **kwargs)
 
     def delete(self, *args, **kwargs):
         if self.id and self.user.local:
-            cache.delete_many([
-                f"book-on-shelf-{book}-{self.shelf.id}"
-                for book in self.book.parent_work.editions.values_list("id", flat=True)
-            ])
+            cache.delete_many(
+                [
+                    f"book-on-shelf-{book}-{self.shelf.id}"
+                    for book in self.book.parent_work.editions.values_list(
+                        "id", flat=True
+                    )
+                ]
+            )
         super().delete(*args, **kwargs)
 
     class Meta:
diff --git a/bookwyrm/templatetags/shelf_tags.py b/bookwyrm/templatetags/shelf_tags.py
index 51e3db8ab..1fb799883 100644
--- a/bookwyrm/templatetags/shelf_tags.py
+++ b/bookwyrm/templatetags/shelf_tags.py
@@ -17,7 +17,7 @@ def get_is_book_on_shelf(book, shelf):
         lambda b, s: s.books.filter(id=b.id).exists(),
         book,
         shelf,
-        timeout=60*60, # just cache this for an hour
+        timeout=60 * 60,  # just cache this for an hour
     )
 
 
@@ -68,7 +68,7 @@ def active_shelf(context, book):
         ),
         user,
         book,
-        timeout=60*60,
+        timeout=60 * 60,
     ) or {"book": book}
 
 
@@ -85,5 +85,5 @@ def latest_read_through(book, user):
         ),
         user,
         book,
-        timeout=60*60,
+        timeout=60 * 60,
     )
diff --git a/bookwyrm/views/reading.py b/bookwyrm/views/reading.py
index e168021d2..eb43e4ea4 100644
--- a/bookwyrm/views/reading.py
+++ b/bookwyrm/views/reading.py
@@ -63,11 +63,12 @@ class ReadingStatus(View):
         )
 
         # invalidate related caches
-        cache.delete_many([
-            f"active_shelf-{request.user.id}-{ed}"
-            for ed in book.parent_work.editions.values_list("id", flat=True)
-        ])
-
+        cache.delete_many(
+            [
+                f"active_shelf-{request.user.id}-{ed}"
+                for ed in book.parent_work.editions.values_list("id", flat=True)
+            ]
+        )
 
         # gets the first shelf that indicates a reading status, or None
         shelves = [