python: return an example of each type, rather than raise an exn
python: return an example of each type, rather than raise an exn

xapi-project/message-switch,djs55/message-switch-1,djs55/message-switch-1,xapi-project/message-switch,djs55/message-switch,xapi-project/message-switch,djs55/message-switch-1,djs55/message-switch,djs55/message-switch