schwemro <rschwem...@yahoo.de> added the comment:

Here is the traceback:

Python 3.6.5 | packaged by conda-forge | (default, Apr  6 2018, 
16:13:55) [MSC v.1900 64 bit (AMD64)]
Type "copyright", "credits" or "license" for more information.

IPython 6.3.1 -- An enhanced Interactive Python.


runfile('C:/Users/Downloads/temp.py', 
wdir='C:/Users/Downloads')
Traceback (most recent call last):

File "<ipython-input-1-8046ea5eaef4>", line 1, in <module>
runfile('C:/Users/Downloads/temp.py', 
wdir='C:/Users/Downloads')

File "C:\ProgramData\Anaconda3\lib\site- 
packages\spyder\utils\site\sitecustomize.py", line 705, in runfile
execfile(filename, namespace)

File "C:\ProgramData\Anaconda3\lib\site- 
packages\spyder\utils\site\sitecustomize.py", line 102, in execfile
exec(compile(f.read(), filename, 'exec'), namespace)

File "C:/Users/Downloads/temp.py", line 22, in <module>
p.map(progresser, L)

File "C:\ProgramData\Anaconda3\lib\multiprocessing\pool.py", line 
266, in map
return self._map_async(func, iterable, mapstar, chunksize).get()

File "C:\ProgramData\Anaconda3\lib\multiprocessing\pool.py", line 
644, in get
raise self._value

AttributeError: 'NoneType' object has no attribute 'write'

Where can I find more details about differences between the two OS? By the way, 
I'm working on mac.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33286>
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