Message 170348 - Python tracker

I propose to close this issue as fixed.

The first two problems in the OP are now resolved through patches to pickle.

The third problem is addressed by issue5370: it is a documented feature of pickle that anyone who defines __setattr__ / __getattr__ that depend on an internal state must also take care to restore that state during unpickling. Otherwise, the code is not pickle-safe, and by extension, not multiprocessing-safe.