AIL's C back-end generates server main loop code as well as client stubs. The Python back-end currently only generates client stubs, so it is not yet possible to write servers in Python. While it is clearly more important to be able to use Python as a client than as a server, the ability to write server prototypes in Python would be a valuable addition: it allows server designers to experiment with interfaces in a much earlier stage of the design, with a much smaller programming effort. This makes it possible to concentrate on concepts first, before worrying about efficient implementation.
The unmarshalling done in the server is almost symmetric with the marshalling in the client, and vice versa, so relative small extensions to the Stubcode virtual machine will allow its use in a server main loop. We hope to find the time to add this feature to a future version of Python.