blah.py

def nodes(evt, node=None):
    nodenames = []

    if node is None:
        root = evt.retrieveObject('')
        node = root.registry()

    if node.object():
        nodenames.append(node.identifier())
        for l in evt.leaves(node):
            # skip a location that takes forever to load
            # XXX How to detect these automatically??
            if "Swum" in l.identifier():
                continue

            temp = evt[l.identifier()]
            nodenames += nodes(evt, l)

    else:
        nodenames.append(node.identifier())

    return nodenames

type interactively.py

# Get a small print out of what is there in the event
evt.dump()

# print out "all" TES locations
# prints out packed locations, so you need to know
# what the unpacked location is called to actually access it
print "-"*80
for node in nodes(evt):
    print node