[Bug 1629123] Re: multiprocessing.Pool fails

[Serhiy Storchaka]

This is a duplicate of bug #628763.

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Title:
  multiprocessing.Pool fails

Status in python3-defaults package in Ubuntu:
  New

Bug description:
  Trying the examples from
  https://docs.python.org/3.5/library/multiprocessing.html#exchanging-objects-between-processes

  
  the example for Pool fails.  It's attached.  The error implicates something missing in SimpleQueue
  $ python3 Pool.py 
  Traceback (most recent call last):
    File "Pool.py", line 13, in <module>
      with Pool(5) as p:
    File "/usr/lib/python3.5/multiprocessing/context.py", line 118, in Pool
      context=self.get_context())
    File "/usr/lib/python3.5/multiprocessing/pool.py", line 150, in __init__
      self._setup_queues()
    File "/usr/lib/python3.5/multiprocessing/pool.py", line 243, in _setup_queues
      self._inqueue = self._ctx.SimpleQueue()
    File "/usr/lib/python3.5/multiprocessing/context.py", line 110, in SimpleQueue
      from .queues import SimpleQueue
    File "/usr/lib/python3.5/multiprocessing/queues.py", line 20, in <module>
      from queue import Empty, Full

  This also fails in the default 2.7 python, with a simpler (less
  informative) error message.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: python3-minimal 3.5.1-3
  ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
  Uname: Linux 4.4.0-34-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Thu Sep 29 15:04:55 2016
  InstallationDate: Installed on 2016-08-08 (52 days ago)
  InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  SourcePackage: python3-defaults
  UpgradeStatus: No upgrade log present (probably fresh install)

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