python singleton into multiprocessing

Question

How can I code to share the same instance of a \"singletonic\" class among processes?

Answer 1

Best is to designate one specific process as owning that instance and dedicated to it; any other process requiring access to that instance obtains it by sending messages to the owning process via a Queue (as supplied by the multiprocessing module) or other IPC mechanisms for message passing, and gets answers back via similar mechanisms.