#         |          /--------|
#         |         |         |                    /-Hsa_001
#         |         |         |          /--------|
#         |         |          \--------|          \-Ptr_001
#          \--------|                   |
#                   |                    \-Mmu_001
#                   |
#                   |          /-Ptr_002
#                    \--------|
#                             |          /-Hsa_002
#                              \--------|
#                                        \-Mmu_002
#
# To obtain all the evolutionary events involving a given leaf node we
# use get_my_evol_events method
matches = t.search_nodes(name="Hsa_001")
human_seq = matches[0]
# Obtains its evolutionary events
events = human_seq.get_my_evol_events()
# Print its orthology and paralogy relationships
print "Events detected that involve Hsa_001:"
for ev in events:
    if ev.etype == "S":
        print '   ORTHOLOGY RELATIONSHIP:', ','.join(ev.in_seqs), "<====>", ','.join(ev.out_seqs)
    elif ev.etype == "D":
        print '   PARALOGY RELATIONSHIP:', ','.join(ev.in_seqs), "<====>", ','.join(ev.out_seqs)

# Alternatively, you can scan the whole tree topology
events = t.get_descendant_evol_events()
# Print its orthology and paralogy relationships
print "Events detected from the root of the tree"