diff --git a/bookwyrm/activitypub/note.py b/bookwyrm/activitypub/note.py
index bea275d16..a739eafa1 100644
--- a/bookwyrm/activitypub/note.py
+++ b/bookwyrm/activitypub/note.py
@@ -13,9 +13,9 @@ class Tombstone(ActivityObject):
 
     type: str = "Tombstone"
 
-    def to_model(self, *args, **kwargs):# pylint: disable=unused-argument
-        ''' this should never really get serialized, just searched for '''
-        model = apps.get_model('bookwyrm.Status')
+    def to_model(self, *args, **kwargs):  # pylint: disable=unused-argument
+        """ this should never really get serialized, just searched for """
+        model = apps.get_model("bookwyrm.Status")
         return model.find_existing_by_remote_id(self.id)
 
 
diff --git a/bookwyrm/migrations/0046_reviewrating.py b/bookwyrm/migrations/0046_reviewrating.py
index e410ba91f..8d1490042 100644
--- a/bookwyrm/migrations/0046_reviewrating.py
+++ b/bookwyrm/migrations/0046_reviewrating.py
@@ -6,44 +6,61 @@ from django.db.models import Q
 import django.db.models.deletion
 from psycopg2.extras import execute_values
 
+
 def convert_review_rating(app_registry, schema_editor):
-    ''' take rating type Reviews and convert them to ReviewRatings '''
+    """ take rating type Reviews and convert them to ReviewRatings """
     db_alias = schema_editor.connection.alias
 
-    reviews = app_registry.get_model(
-        'bookwyrm', 'Review'
-    ).objects.using(db_alias).filter(
-        Q(content__isnull=True) | Q(content='')
+    reviews = (
+        app_registry.get_model("bookwyrm", "Review")
+        .objects.using(db_alias)
+        .filter(Q(content__isnull=True) | Q(content=""))
     )
 
     with connection.cursor() as cursor:
         values = [(r.id,) for r in reviews]
-        execute_values(cursor, '''
+        execute_values(
+            cursor,
+            """
 INSERT INTO bookwyrm_reviewrating(review_ptr_id)
-VALUES %s''', values)
+VALUES %s""",
+            values,
+        )
+
 
 def unconvert_review_rating(app_registry, schema_editor):
-    ''' undo the conversion from ratings back to reviews'''
+    """ undo the conversion from ratings back to reviews"""
     # All we need to do to revert this is drop the table, which Django will do
     # on its own, as long as we have a valid reverse function. So, this is a
     # no-op function so Django will do its thing
 
+
 class Migration(migrations.Migration):
 
     dependencies = [
-        ('bookwyrm', '0045_auto_20210210_2114'),
+        ("bookwyrm", "0045_auto_20210210_2114"),
     ]
 
     operations = [
         migrations.CreateModel(
-            name='ReviewRating',
+            name="ReviewRating",
             fields=[
-                ('review_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='bookwyrm.Review')),
+                (
+                    "review_ptr",
+                    models.OneToOneField(
+                        auto_created=True,
+                        on_delete=django.db.models.deletion.CASCADE,
+                        parent_link=True,
+                        primary_key=True,
+                        serialize=False,
+                        to="bookwyrm.Review",
+                    ),
+                ),
             ],
             options={
-                'abstract': False,
+                "abstract": False,
             },
-            bases=('bookwyrm.review',),
+            bases=("bookwyrm.review",),
         ),
         migrations.RunPython(convert_review_rating, unconvert_review_rating),
     ]
diff --git a/bookwyrm/migrations/0047_merge_20210228_1839.py b/bookwyrm/migrations/0047_merge_20210228_1839.py
index 7e410761a..4be39e56f 100644
--- a/bookwyrm/migrations/0047_merge_20210228_1839.py
+++ b/bookwyrm/migrations/0047_merge_20210228_1839.py
@@ -6,9 +6,8 @@ from django.db import migrations
 class Migration(migrations.Migration):
 
     dependencies = [
-        ('bookwyrm', '0046_reviewrating'),
-        ('bookwyrm', '0046_sitesettings_privacy_policy'),
+        ("bookwyrm", "0046_reviewrating"),
+        ("bookwyrm", "0046_sitesettings_privacy_policy"),
     ]
 
-    operations = [
-    ]
+    operations = []
diff --git a/bookwyrm/models/status.py b/bookwyrm/models/status.py
index 9378772c6..80f2b593a 100644
--- a/bookwyrm/models/status.py
+++ b/bookwyrm/models/status.py
@@ -295,11 +295,11 @@ class Review(Status):
 
 
 class ReviewRating(Review):
-    ''' a subtype of review that only contains a rating '''
+    """ a subtype of review that only contains a rating """
+
     def save(self, *args, **kwargs):
         if not self.rating:
-            raise ValueError(
-                'ReviewRating object must include a numerical rating')
+            raise ValueError("ReviewRating object must include a numerical rating")
         return super().save(*args, **kwargs)
 
     @property
@@ -307,7 +307,7 @@ class ReviewRating(Review):
         return 'Rated "{}": {:d} stars'.format(self.book.title, self.rating)
 
     activity_serializer = activitypub.Rating
-    pure_type = 'Note'
+    pure_type = "Note"
 
 
 class Boost(ActivityMixin, Status):