plpython function with dictionary as function argument?

Hi all. I need to know if it is possible to call a plpython stored funcion
with an dictionary as single argument:

Suppose this python structure:

someDict = {
'field1': 'Foo',
'creepyfield': 'Bar'
}

The data base connection
CONN = pg.connect()....

I want some pypgslq function

CREATE myfunction ( __dictionary__) returns void
AS
.... (process)
LANGUAGE pythonu

and (the desired goal) be able to execute
CONN.execute("select * from myfunction (someDict)")

It this possible?

Thanks!!
--
Gerardo Herzig
Direccion General de Organizacion y Sistemas
Facultad de Medicina
U.B.A.