Hi, When I try to read a graphml file an exception is thrown but cannot be passed back to python through boost.python as no converter is registered. I'm using SVN version 338 from https://svn.osl.iu.edu/svn/projects_viz/bgl-python. The output is: c:\dev\python\boost\graph\__init__.py in read_graphml(filename) 624 """ 625 try: --> 626 graph = Digraph.read_graphml(filename) 627 except UndirectedGraphError: 628 graph = Graph.read_graphml(filename) <type 'exceptions.TypeError'>: No to_python (by-value) converter found for C++ type: struct boost::graph_exception If I just try the following: bgl.Graph.read_graphml(filename) I get something that might be a different symptom of the same problem: <type 'exceptions.SystemError'>: 'finally' pops bad exception The graphml file is: <?xml version="1.0" encoding="UTF-8"?> <!-- Created by yFiles 2.4.2.2 --> <graphml xmlns="http://graphml.graphdrawing.org/xmlns/graphml" xmlns:y="http://www.yworks.com/xml/graphml" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns/graphml http://www.yworks.com/xml/schema/graphml/1.0/ygraphml.xsd"> <key id="d0" for="node" yfiles.type="nodegraphics"/> <key id="d1" for="edge" yfiles.type="edgegraphics"/> <graph id="G" edgedefault="directed"> <node id="n0"> <data key="d0" > <y:ShapeNode > <y:Geometry x="0.0" y="0.0" width="30.0" height="30.0"/> <y:Fill color="#FFCC00" transparent="false"/> <y:BorderStyle type="line" width="1.0" color="#000000" /> <y:NodeLabel x="13.0" y="13.0" width="4.0" height="4.0" visible="true" alignment="center" fontFamily="Dialog" fontSize="13" fontStyle="plain" textColor="#000000" hasBackgroundColor="false" hasLineColor="false" modelName="internal" modelPosition="c" autoSizePolicy="content"></y:NodeLabel> <y:Shape type="ellipse"/> </y:ShapeNode> </data> </node> <node id="n1"> <data key="d0" > <y:ShapeNode > <y:Geometry x="18.0" y="68.0" width="30.0" height="30.0"/> <y:Fill color="#FFCC00" transparent="false"/> <y:BorderStyle type="line" width="1.0" color="#000000" /> <y:NodeLabel x="13.0" y="13.0" width="4.0" height="4.0" visible="true" alignment="center" fontFamily="Dialog" fontSize="13" fontStyle="plain" textColor="#000000" hasBackgroundColor="false" hasLineColor="false" modelName="internal" modelPosition="c" autoSizePolicy="content"></y:NodeLabel> <y:Shape type="rectangle"/> </y:ShapeNode> </data> </node> <edge id="e0" source="n0" target="n1"> <data key="d1" > <y:PolyLineEdge > <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/> <y:LineStyle type="line" width="1.0" color="#000000" /> <y:Arrows source="none" target="standard"/> <y:BendStyle smoothed="false"/> </y:PolyLineEdge> </data> </edge> </graph> </graphml> Thanks for a great library, John.