PARLEY and Pykka are listed on this Wikipedia Actor Model page so you might want to look into one of those.
Pykka seems to be actively developed (1.0.1 released in Dec 2012) whereas PARLEY hasn't had a release since 2007 (and is still listed as beta) . Pykka claims to be insipired by Akka only in name is not a simply a python port.
