Steven Myint added the comment:
I didn't quite understand the multiprocessing test cases, but attached is a
standalone test case that reproduces the problem. The problem only shows up
when using ThreadPool.
$ python thread_pool_exception_test.py
Traceback (most recent call last):
File "thread_pool_exception_test.py", line 7, in <module>
pool.map(exception, [1])
File
"/opt/local/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/multiprocessing/pool.py",
line 255, in map
return self._map_async(func, iterable, mapstar, chunksize).get()
File
"/opt/local/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/multiprocessing/pool.py",
line 594, in get
raise self._value
TypeError: exceptions must derive from BaseException
----------
Added file: http://bugs.python.org/file34520/thread_pool_exception_test.py
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<http://bugs.python.org/issue20980>
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