diff --git a/cordex/__init__.py b/cordex/__init__.py
index 639a83c..903ba10 100644
--- a/cordex/__init__.py
+++ b/cordex/__init__.py
@@ -2,7 +2,14 @@
 
 from . import regions, tables, tutorial
 from .accessor import CordexDataArrayAccessor, CordexDatasetAccessor  # noqa
-from .domain import cordex_domain, create_dataset, domain, domain_info, vertices, rewrite_coords
+from .domain import (
+    cordex_domain,
+    create_dataset,
+    domain,
+    domain_info,
+    vertices,
+    rewrite_coords,
+)
 from .tables import domains, ecmwf
 from .transform import (
     map_crs,
diff --git a/cordex/domain.py b/cordex/domain.py
index 78a7f2d..1fc388f 100644
--- a/cordex/domain.py
+++ b/cordex/domain.py
@@ -594,8 +594,11 @@ def rewrite_coords(ds, coords="xy", domain_id=None, mip_era="CMIP5", method="nea
     ds : xr.Dataset
         The dataset with rewritten coordinates.
     """
-    if domain_id is None and ds.cf["grid_mapping"].grid_mapping_name == "rotated_latitude_longitude":
-        domain_id = ds.cx.domain_id 
+    if (
+        domain_id is None
+        and ds.cf["grid_mapping"].grid_mapping_name == "rotated_latitude_longitude"
+    ):
+        domain_id = ds.cx.domain_id
     if domain_id:
         grid_info = domain_info(domain_id)
         dx = grid_info["dlon"]
@@ -619,25 +622,28 @@ def rewrite_coords(ds, coords="xy", domain_id=None, mip_era="CMIP5", method="nea
 
     if coords == "xy" or coords == "all":
         ds = ds.cf.reindex(X=xn, Y=yn, method=method)
- 
+
     if coords == "lonlat" or coords == "all":
         try:
-            trg_dims=(ds.cf["longitude"].name, ds.cf["latitude"].name)
-            overwrite=True
+            trg_dims = (ds.cf["longitude"].name, ds.cf["latitude"].name)
+            overwrite = True
         except KeyError:
-            trg_dims=("lon", "lat")
-            overwrite=False
+            trg_dims = ("lon", "lat")
+            overwrite = False
         dst = transform_coords(ds, trg_dims=trg_dims)
         if overwrite is False:
-            ds = ds.assign_coords({trg_dims[0]: dst[trg_dims[0]], trg_dims[1]: dst[trg_dims[1]]})
+            ds = ds.assign_coords(
+                {trg_dims[0]: dst[trg_dims[0]], trg_dims[1]: dst[trg_dims[1]]}
+            )
             ds[trg_dims[0]].attrs = cf.vocabulary[mip_era]["coords"][trg_dims[0]]
             ds[trg_dims[1]].attrs = cf.vocabulary[mip_era]["coords"][trg_dims[1]]
         else:
             ds[trg_dims[0]][:] = dst[trg_dims[0]]
             ds[trg_dims[1]][:] = dst[trg_dims[1]]
-        
+
     return ds
 
+
 def _crop_to_domain(ds, domain_id, drop=True):
     domain = cordex_domain(domain_id)
     x_mask = ds.cf["X"].round(8).isin(domain.cf["X"])