python graph implementation

And now as I have promised in my previous post. it needs some more work, i.e. dumping to Graphviz format, but apart of that it is working quite well.

metaclass with dynamic creation of properties

Meteclass with dynamic properties creation: Written as helper class for my graph implementation (metaclass for nodes, edges and graph itself).

one type list in python

Handy list-like class holding only one type of items.