diff --git a/zfs-backup.py b/zfs-backup.py
index 36186b1..91b66f2 100755
--- a/zfs-backup.py
+++ b/zfs-backup.py
@@ -105,10 +105,6 @@ class ZFSPath:
     def replace_pool(self, pool: str) -> ZFSPath:
         return ZFSPath([pool] + self._elements[1:], self.snapname)
 
-    #    @property
-    #    def pool_name(self) -> str:
-    #        return self._elements[0]
-    #
     @property
     def name_without_pool(self) -> str:
         name = "/".join(self._elements[1:])
@@ -380,7 +376,9 @@ class Dataset:
 
     def _clean_old_snapshots_for_interval(self, interval: str, max_count: int):
         regex = ".*".join(["", config.snapshot_tag, interval, ""])
-        snapshots = [snapshot for snapshot in self.snapshots if snapshot.matches_regex(regex)]
+        snapshots = [
+            snapshot for snapshot in self.snapshots if snapshot.matches_regex(regex)
+        ]
         if len(snapshots) > max_count:
             snapshots.sort()
             for snap in snapshots[:-max_count]: