diff --git a/py-polars/polars/dataframe/frame.py b/py-polars/polars/dataframe/frame.py
index d4d1368f3559..ebcc0e6d3687 100644
--- a/py-polars/polars/dataframe/frame.py
+++ b/py-polars/polars/dataframe/frame.py
@@ -10446,7 +10446,7 @@ def rows_by_key(
             data_cols = [k for k in self.schema if k not in key]
             values = self.select(data_cols)
 
-        zipped = zip(keys, values.iter_rows(named=named)) # type: ignore[call-overload]
+        zipped = zip(keys, values.iter_rows(named=named))  # type: ignore[call-overload]
 
         # if unique, we expect to write just one entry per key; otherwise, we're
         # returning a list of rows for each key, so append into a defaultdict.