Hi,

I have saved a graph in Networkx with .graphml format. I can successfully load 
the graph in graph-tool and I can see the edge property attached to graph. 
However, when I try to access the values I get an error that the property does 
not exist.

G = 
gt.load_graph('gdrive/MyDrive/ColabNotebooks/Thesis/sources/k4p3-2-test.graphml')
G.properties

{('e',
  '_graphml_edge_id'): <EdgePropertyMap object with value type 'string', for 
Graph 0x7f0347bd2950, at 0x7f0347d2a4d0>,
 ('e',
  'etype'): <EdgePropertyMap object with value type 'int32_t', for Graph 
0x7f0347bd2950, at 0x7f0347d2af50>,
 ('v',
  '_graphml_vertex_id'): <VertexPropertyMap object with value type 'string', 
for Graph 0x7f0347bd2950, at 0x7f0347d2aa50>}

e = G.edges().next()
etype[e]
NameError: name 'etype' is not defined
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