after dealing with a few difficult problems, I finally got a first prototype of the "list content type support" implemented:
image_size = 800, 600 x, y = image_size # it should know that x, y are ints
Oh, and one more note: This feature is decorator-based, so all classes with a specific decorator are considered "container" classes. Thus, you can add your own containers by just using the @TypeContainer decorator, and the plugin will track their types.
Apart from adding that feature, I fixed some (more or less severe) bugs since alpha1.1, and the plugin can now parse pypy (one million LoC) without crashing (however it needs quite a few minutes to do so...).
Have Fun, and feel free to email me about problems.