This listing is of frameworks that can be used at your average web hosting service. No frameworks that require that you run your own processes are included.
gg: number indicates numer of hits in comp.lang.python during the last two years
http://www.mems-exchange.org/software/quixote/
gg: 180
gg: 66
http://www.object-craft.com.au/projects/albatross
gg: 48
gg: 14