diff --git a/xarray/backends/h5netcdf_.py b/xarray/backends/h5netcdf_.py
index 5fdb20b8407..a37887a5b89 100644
--- a/xarray/backends/h5netcdf_.py
+++ b/xarray/backends/h5netcdf_.py
@@ -536,5 +536,4 @@ def open_groups(
         return groups_dict
 
 
-
 BACKEND_ENTRYPOINTS["h5netcdf"] = ("h5netcdf", H5netcdfBackendEntrypoint)
diff --git a/xarray/backends/netCDF4_.py b/xarray/backends/netCDF4_.py
index 9a2f563d8dd..45d8da51334 100644
--- a/xarray/backends/netCDF4_.py
+++ b/xarray/backends/netCDF4_.py
@@ -723,7 +723,6 @@ def open_datatree(
 
         return DataTree.from_dict(groups_dict)
 
-
     def open_groups(
         self,
         filename_or_obj: str | os.PathLike[Any] | BufferedIOBase | AbstractDataStore,