can't connect to postgresql using pygresql

[rdack]

using pygresql-3.2, postgresql-7.1.3, mac os x 10.0?, g4

i can import _pg, but get error on connect:
>>>db=_pg.connect('tt1', 'localhost')
_pg.error: PQconnectPoll() -- connect() failed: Connection refused
        Is the postmaster running (with -i) at 'localhost'
        and accepting connections on TCP/IP port 5432?

port# problem? how do i determine what port postgresql is waiting on?
could it be a path problem? i can run psql and see my db from the
directory python is running from.

anything else i could check?