diff --git a/python/cudf/cudf/core/indexed_frame.py b/python/cudf/cudf/core/indexed_frame.py
index 18255baef88..e58a8bd179e 100644
--- a/python/cudf/cudf/core/indexed_frame.py
+++ b/python/cudf/cudf/core/indexed_frame.py
@@ -1108,9 +1108,7 @@ def dot(self, other, reflect=False):
         elif isinstance(self, cudf.DataFrame) and isinstance(
             other, (cudf.Series, cudf.DataFrame)
         ):
-            common = self._data.to_pandas_index.union(
-                other.index.to_pandas()
-            )
+            common = self._data.to_pandas_index.union(other.index.to_pandas())
             if len(common) > self._num_columns or len(common) > len(
                 other.index
             ):
diff --git a/python/cudf/cudf/core/reshape.py b/python/cudf/cudf/core/reshape.py
index ec0e83fa3d7..3c553598152 100644
--- a/python/cudf/cudf/core/reshape.py
+++ b/python/cudf/cudf/core/reshape.py
@@ -431,8 +431,9 @@ def concat(
 
             result_columns = (
                 objs[0]
-                ._data.to_pandas_index
-                .append([obj._data.to_pandas_index for obj in objs[1:]])
+                ._data.to_pandas_index.append(
+                    [obj._data.to_pandas_index for obj in objs[1:]]
+                )
                 .unique()
             )