order missing

narwhals-dev · Jan 11, 2025 · 287713b · 287713b
1 parent 6f76255
commit 287713b
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Showing 2 changed files with 2 additions and 2 deletions.
diff --git a/narwhals/utils.py b/narwhals/utils.py
@@ -1063,5 +1063,5 @@ def generate_repr(header: str, native_repr: str) -> str:
 
 def check_column_exists(columns: list[str], subset: list[str] | None) -> None:
     if subset is not None and (missing := set(subset).difference(columns)):
-        msg = f"Column(s) {missing} not found in {columns}"
+        msg = f"Column(s) {sorted(missing)} not found in {columns}"
         raise ColumnNotFoundError(msg)
diff --git a/tests/utils_test.py b/tests/utils_test.py
@@ -294,6 +294,6 @@ def test_check_column_exists() -> None:
     subset = ["d", "f"]
     with pytest.raises(
         ColumnNotFoundError,
-        match=re.escape("Column(s) {'f', 'd'} not found in ['a', 'b', 'c']"),
+        match=re.escape("Column(s) ['d', 'f'] not found in ['a', 'b', 'c']"),
     ):
         check_column_exists(columns, subset)