[issue23382] Maybe can not shutdown ThreadPoolExecutor when call the method of shutdown

[Mark Lawrence]

Mark Lawrence added the comment:

@Miles could you provide the code changes as a unified diff file, and if needed any changes to the test code as well, thanks.

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components: +Library (Lib) -2to3 (2.x to 3.x conversion tool)
nosy: +BreamoreBoy
type:  -> behavior
versions: +Python 2.7, Python 3.4, Python 3.5 -Python 3.2

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<http://bugs.python.org/issue23382>
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