Richard Oudkerk added the comment:
I suspect the problem is caused by nose's isolate plugin.
With this enabled, a copy of sys.modules is saved before each test and then
restored after the test. This causes garbage collection of newly imported
modules. The destructor for the module type causes all globals to be replaced
by None.
This will break the atexit function registered by multiprocessing since it
depends on globals.
PS. A simple work-around (which does not require people to upgrade to a
bugfixed version of Python) is to put
try:
import multiprocessing
except ImportError:
pass
near the beginning of setup.py. After this change I don't get the error when
running "python setup.py test".
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