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When adding a property to graph-tool don't forget this

When you are adding a new property to a graph-tool graph (

is_node_customer = network.new_vertex_property("bool")
weight = network.new_edge_property("float")

 you should never forget to add this

network.vertex_properties["is_node_customer"] = is_node_customer
network.edge_properties["weight"] = weight

Otherwise the properties will not saved or stored together with the graph and you will lose a lot of time

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