Inherit property in condensed_graph
The graph_tool.community.condensation_graph method uses a vertex property to aggregate vertices into a single node. However the returned graph has no property at all, and then it's impossible to determine which vertex represents a group of nodes.
It would be nice if the method would return also a vertex property map mirroring the one given as input.
Example (simplified notation):
from
graph_prop = {0: "a", 1: "b", 2: "a", 3: "a", 4: "c", 5: "b"}
you should get (vcount is used as reference)
vcount = {0: 3, 1: 2, 2: 1}
condensed_prop = {0:"a", 1: "b", 2: "c"}