sqlite3: fix row_factory deletion error (#8693)

Match CPython 3.14 by distinguishing row_factory assignment from deletion and raising AttributeError with the compatible message. Unmark the passing row_factory deletion test.

Assisted-by: GitHub Copilot:GPT-5.6 Luna (high)

Lib/test/test_sqlite3/test_factory.py

@@ -159,7 +159,6 @@ class RowFactoryTests(MemoryDatabaseMixin, unittest.TestCase):
         with self.assertRaises(IndexError):
             row[complex()]  # index must be int or string
 
-    @unittest.expectedFailure  # TODO: RUSTPYTHON; TypeError: can't delete attribute
     def test_delete_connection_row_factory(self):
         # gh-149738: deleting row_factory should raise an exception
         with self.assertRaises(AttributeError):

crates/stdlib/src/_sqlite3.rs

@@ -1661,8 +1661,20 @@ mod _sqlite3 {
             self.row_factory.to_owned()
         }
         #[pygetset(setter)]
-        fn set_row_factory(&self, val: Option<PyObjectRef>) {
-            let _ = unsafe { self.row_factory.swap(val) };
+        fn set_row_factory(
+            &self,
+            val: PySetterValue<Option<PyObjectRef>>,
+            vm: &VirtualMachine,
+        ) -> PyResult<()> {
+            match val {
+                PySetterValue::Assign(val) => {
+                    let _ = unsafe { self.row_factory.swap(val) };
+                    Ok(())
+                }
+                PySetterValue::Delete => {
+                    Err(vm.new_attribute_error("cannot delete row_factory attribute"))
+                }
+            }
         }
 
         fn check_thread(&self, vm: &VirtualMachine) -> PyResult<()> {