diff --git a/obsidian_import/__init__.py b/obsidian_import/__init__.py
index cb3a39f..38a3c9c 100644
--- a/obsidian_import/__init__.py
+++ b/obsidian_import/__init__.py
@@ -194,8 +194,9 @@ def import_activity_samples(
     group_category: str | None = None,
     default_estimated_duration: datetime.timedelta | None = None,
 ) -> int:
-    samples = heuristically_realize_samples(raw_samples,
-                                            default_estimated_duration=default_estimated_duration)
+    samples = heuristically_realize_samples(
+        raw_samples, default_estimated_duration=default_estimated_duration,
+    )
 
     if group_category is not None:
         samples = merge_adjacent_samples(list(samples), group_category)
@@ -233,6 +234,7 @@ def import_activity_samples(
 
     return num_updated
 
+
 def import_activity_sample_csv(
     vault: ObsidianVault,
     rows: Rows,
@@ -273,7 +275,11 @@ def import_wanikani_events(vault: ObsidianVault, rows: Rows):
     for row in rows:
         for k in keys:
             if k in row:
-                raw_samples.append(ActivitySample([Label('application.name', 'WaniKani')], None, row[k]))
+                raw_samples.append(
+                    ActivitySample(
+                        [Label('application.name', 'WaniKani')], None, row[k],
+                    ),
+                )
             del k
         del row
 
@@ -285,9 +291,14 @@ def import_wanikani_events(vault: ObsidianVault, rows: Rows):
             comment='',
         )
 
-    return import_activity_samples(vault, raw_samples, mapper,
-                                   group_category='application.name',
-                                   default_estimated_duration=datetime.timedelta(minutes=5))
+    return import_activity_samples(
+        vault,
+        raw_samples,
+        mapper,
+        group_category='application.name',
+        default_estimated_duration=datetime.timedelta(minutes=5),
+    )
+
 
 PATH_WATCHED = Path('output/show_episodes_watched.csv')
 PATH_PLAYED = Path('output/games_played.csv')
@@ -300,7 +311,11 @@ PATH_STEPMANIA = Path('output/stepmania.csv')
 
 
 IMPORTERS = [
-    {'path': PATH_WANIKANI, 'standard_variant': True, 'import_rows': import_wanikani_events},
+    {
+        'path': PATH_WANIKANI,
+        'standard_variant': True,
+        'import_rows': import_wanikani_events,
+    },
     {'path': PATH_WORKOUT, 'standard_variant': True, 'import_rows': import_workout_csv},
     {'path': PATH_STEP_COUNTS, 'import_rows': import_step_counts_csv},
     {