I've just realized that the input nodes are seen as strings from a dotfile, in which case if they are sorted, it may be lexicographically i.e. 1,10,11,12,13,14,15,16,17,18,19,2,20,21 etc.
Does graph-tool sort the node id's internally, i.e. can I post-process the community output with this ordering? ...quite keen to do that as the community assignment took about 3 days to run ;)

thank you very much
Alan