When I create a graph like this:
self.graph = Graph(directed=True)
self.is_on = self.graph.new_vertex_property("boolean")
and want to use it in another class method:
self.is_on.set_value(False)
I get the error:
libcore.set_vertex_property(g._Graph__graph, _prop("v", g, self), val)
AttributeError: 'NoneType' object has no attribute '_Graph__graph'
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