Python 3 preparation: avoid assigning to instance __getitem__ in TruthDict. In Python 3, special method names are generally only looked up at the class level, not on instance objects, and so assigning to them for an instance object doesn't work as expected.

try:
    # Python 3+.
    from xmlrpc import client, server
except ImportError:
    # Python 2.
    import xmlrpclib as client
    import SimpleXMLRPCServer as server