How to use multiprocessing with class instances in Python?

Question

I am trying to create a class than can run a separate process to go do some work that takes a long time, launch a bunch of these from a main module and then wait for them all to

Answer 1

Instead of attempting to send a method itself (which is impractical), try sending a name of a method to execute.

Provided that each worker runs the same code, it's a matter of a simple getattr(self, task_name).

I'd pass tuples (task_name, task_args), where task_args were a dict to be directly fed to the task method:

next_task_name, next_task_args = self.task_q.get()
if next_task_name:
  task = getattr(self, next_task_name)
  answer = task(**next_task_args)
  ...
else:
  # poison pill, shut down
  break