[Python] Clear TList in tseqcollection_itemaccess.py:test_delitem

Clear the TList at the end of the `test_delitem` unit test in
tseqcollection_itemaccess.py to make sure the contained list elements
are still alive when the list is cleared. Otherwise, the elements might
be deleted before the containing list, depending on the order or garbage
collection.

Author: guitargeek

bindings/pyroot/pythonizations/test/tseqcollection_itemaccess.py

@@ -125,6 +125,10 @@ def test_setitem(self):
         with self.assertRaises(TypeError):
             sc[1.0] = ROOT.TObject()
 
+        # Clear before the added element might be garbage collected,
+        # to avoid dangling pointer access.
+        sc.Clear()
+
     def test_setitem_slice(self):
         sc1 = self.create_tseqcollection()
         sc2 = self.create_tseqcollection()
@@ -239,6 +243,8 @@ def test_delitem(self):
         with self.assertRaises(TypeError):
             del sc[1.0]
 
+        sc.Clear()
+
     def test_delitem_slice(self):
         # Delete all items
         sc1 = self.create_tseqcollection()