larkost added the comment:
We just got bitten by this issue because we are trying to be compatible across
2.x and 3.x (including 3.0-3.2). For anyone who runs into the "missing 1
required keyword-only argument: 'ctx'" here is an import statement that works:
try:
from multiprocessing import SimpleQueue
except ImportError:
from multiprocessing.queues import SimpleQueue
Replace SimpleQueue with JoinableQueue if you need that. Importing in the other
order will wind you up in problems in 3.4.2+.
----------
nosy: +larkost
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<http://bugs.python.org/issue21367>
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