Issue #1327 fixed (segfault in pymod finalization code)

testdata/pymod/issue1327.py

@@ -0,0 +1,28 @@
+# KLayout Layout Viewer
+# Copyright (C) 2006-2023 Matthias Koefferlein
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+import klayout.db as kdb
+
+ly = kdb.Layout()
+cell = ly.create_cell("TOP")
+parents = cell.each_parent_cell()
+
+# makes the unit test happy
+print("OK")
+
+# was crashing now in finalization code ..
+