feat: DuckDB dt.weekday (#1795)

narwhals-dev · Jan 11, 2025 · 0af14cd · 0af14cd
1 parent f1b9fd9
commit 0af14cd
Show file tree

Hide file tree

Showing 2 changed files with 10 additions and 1 deletion.
diff --git a/narwhals/_duckdb/expr_dt.py b/narwhals/_duckdb/expr_dt.py
@@ -93,3 +93,12 @@ def nanosecond(self) -> DuckDBExpr:
             "nanosecond",
             returns_scalar=self._compliant_expr._returns_scalar,
         )
+
+    def weekday(self) -> DuckDBExpr:
+        from duckdb import FunctionExpression
+
+        return self._compliant_expr._from_call(
+            lambda _input: FunctionExpression("isodow", _input),
+            "weekday",
+            returns_scalar=self._compliant_expr._returns_scalar,
+        )
diff --git a/tests/expr_and_series/dt/datetime_attributes_test.py b/tests/expr_and_series/dt/datetime_attributes_test.py
@@ -49,7 +49,7 @@ def test_datetime_attributes(
         request.applymarker(pytest.mark.xfail)
     if attribute == "date" and "cudf" in str(constructor):
         request.applymarker(pytest.mark.xfail)
-    if "duckdb" in str(constructor) and attribute in ("date", "weekday", "ordinal_day"):
+    if "duckdb" in str(constructor) and attribute in ("date", "ordinal_day"):
         request.applymarker(pytest.mark.xfail)
     if "pyspark" in str(constructor):
         request.applymarker(pytest.mark.xfail)