Hi, After processing an external text file I create a an object that among other things holds a graph object, properties, vertices etc etc. I would like to save the original copy of the object, so after I can always refer back to it in a speedy fashion without having to re-parse the text file and re-initialize the object, but when I tried to use deepcopy() it complains. I can not even perform a deep copy on a Vertex object. Any idea why this is happening, and most importantly is there a work around? (I tried pickle and shelve and they do not work either). Thanks in advance for the response, Vaggelis -- View this message in context: http://main-discussion-list-for-the-graph-tool-project.982480.n3.nabble.com/... Sent from the Main discussion list for the graph-tool project mailing list archive at Nabble.com.