How to run multiprocessing code in wxPython app so it's non-blocking?

Question

In my test I extract data from Oracle after user makes choice of tables from wxListCtrl. The problem is that long extract using multiprocessing module blocks wxPython UI. How to do it without blocking? Will it be pythonic to execute multiprocessing in threading.Thread?

Answer 1

You can let a pool run your processes or threads and you can give pool a max number of processes that it runs at one moment.

MaxProcessors = process.cpu_count()-1
self.pool = process.Pool(processes=min(NumberofProcess,MaxProcessors))

I use MaxProcessors to make sure there is always one core available for windows and the GUI.