diff --git a/test/python-bug.py b/test/python-bug.py
new file mode 100755
index 00000000..db5ea1fb
--- /dev/null
+++ b/test/python-bug.py
@@ -0,0 +1,23 @@
+#!/bin/env python
+
+# this works...
+l = [[1, []]]
+l[0][1] += [1]
+
+# let's change the structure a bit...
+l = [(1, [])]
+
+# now, this also works...
+e = l[0][1]
+e += [1]
+
+
+# XXX and this fails...
+l[0][1] += [1]
+
+
+# and here is how...
+## Traceback (most recent call last):
+##   File "F:\work\ImageGrid\cur\ImageGrid\src\test\python-bug.py", line 17, in <module>
+##     l[0][1] += [1]
+## TypeError: 'tuple' object does not support item assignment