cleanup code

lightrag/kg/mongo_impl.py

@@ -35,7 +35,7 @@ class MongoKVStorage(BaseKVStorage):
     async def get_by_id(self, id: str) -> Union[dict[str, Any], None]:
         return self._data.find_one({"_id": id})
 
-    async def get_by_ids(self, ids: list[str]) -> list[Union[dict[str, Any], None]]:   
+    async def get_by_ids(self, ids: list[str]) -> list[Union[dict[str, Any], None]]:
         return list(self._data.find({"_id": {"$in": ids}}))
 
     async def filter_keys(self, data: list[str]) -> set[str]:
@@ -77,7 +77,9 @@ class MongoKVStorage(BaseKVStorage):
         """Drop the collection"""
         await self._data.drop()
 
-    async def get_by_status_and_ids(self, status: str) -> Union[list[dict[str, Any]], None]:
+    async def get_by_status_and_ids(
+        self, status: str
+    ) -> Union[list[dict[str, Any]], None]:
         """Get documents by status and ids"""
         return self._data.find({"status": status})