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> Shouldn't the `for` loop be outside the outer `with` block?
Yes.
> In Lib/multiprocessing/managers.py:
> Is there a good reason why the wait_for() proxy method can't simply be
> implemented as:
> return self._callmethod('wait_for', (predicate, timeout))?
> 
> (There may be, I just didn't check).
That would only work if predicate is picklable, which is unlikely to be the case. (The lambda functions used in the unit tests are not picklable.)
> Finally, the documentation should be updated 
> (Doc/library/multiprocessing.rst).
Fixed in new patch.
> Otherwise, it would probably be better if you could submit a contributor 
> agreement (and also maybe update your name on the tracker), unless that's
> a problem for you?
I will try to submit it over the weekend.