[graph-tool] Large Node ID

Hi, I have a huge graph saved in a text file as an edge list. i.e., "node_id_v, node_id_w". As the node IDs are very large I have to use "long()" to convert "node_id_v" to a number. Therefore, I run in trouble when passing those longs to "add_edge()". Is there a workaround? Best, Chris