Questions about Python stickies?

Good afternoon,

I have just a few quick Python questions about sticky dictionaries.

1. Is it possible to store a list in a sticky?

    i.e. sticky["list"] = list

2. Can you update or alter the list inside the sticky?

    i.e. sticky["list"].append(item)

3. Is it possible to store nested lists in a sticky?

    i.e. sticky["nested"] = [[item1, item2], [item3, item4], [item5, item6]]

4. Are stickies stored until deleted manually or what else could affect them? 

Thanks.