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Right now, the multiprocessing code is littered with statements like:
 assert self._popen is None, 'cannot start a process twice'
 assert self._parent_pid == os.getpid(), \
 'can only start a process object created by current 
process'
 assert not _current_process._daemonic, \
 'daemonic processes are not allowed to have children'
These will obviously be stripped out if running in optimized mode - 
however its not cool to rely on these anyway, the code should be 
refactored to proper checks, e.g.:
 if not hasattr(lock, 'acquire'):
 raise AttributeError("'%r' has no method 'acquire'" % lock)