diff --git a/xarray/backends/zarr.py b/xarray/backends/zarr.py
index e6fe93a398a..775bd1e6d80 100644
--- a/xarray/backends/zarr.py
+++ b/xarray/backends/zarr.py
@@ -288,7 +288,7 @@ def extract_zarr_variable_encoding(
     safe_chunks=True,
     region=None,
     mode=None,
-    shape=None
+    shape=None,
 ):
     """
     Extract zarr encoding dictionary from xarray Variable
@@ -341,7 +341,7 @@ def extract_zarr_variable_encoding(
         safe_chunks=safe_chunks,
         region=region,
         mode=mode,
-        shape=shape
+        shape=shape,
     )
     encoding["chunks"] = chunks
     return encoding
@@ -881,7 +881,7 @@ def set_variables(self, variables, check_encoding_set, writer, unlimited_dims=No
                 safe_chunks=self._safe_chunks,
                 region=region,
                 mode=self._mode,
-                shape=zarr_shape
+                shape=zarr_shape,
             )
 
             if name not in existing_keys:
diff --git a/xarray/tests/test_backends.py b/xarray/tests/test_backends.py
index c04f71ae61c..6529dd74c21 100644
--- a/xarray/tests/test_backends.py
+++ b/xarray/tests/test_backends.py
@@ -6254,5 +6254,3 @@ def test_zarr_safe_chunk_region(tmp_path):
         # If the chunk is of size equal to the one in the Zarr encoding, but
         # it is partially writing in the last chunk then raise an error
         arr.isel(a=slice(8, None)).chunk(a=3).to_zarr(store, region="auto", mode="r+")
-
-