Simple tool/library to visualize huge python dict

I have a huge dict structure like this one: ``` my_data = { 'key1': { '_': 'value1': 'aaa' }, 'key2': { '_': 'value2': 'bbb', 'key2.1': { '_': 'ccc', 'key2.1.1': { '_': 'ddd' } } 'key2.2': { '_': 'eee', 'key2.2.1': { '_': 'fff' } 'key2.2.2': { '_': 'ggg' } } } } ``` and so on. I want to display it to user in a kind of tree representation, using GTK, TK or anything to be able to browse it collapse and expand branches and probably search keys and values. May be I do not need to develop such a tool by hands and there is already something that can visualize this kind of data out of the box?