[issue29108] Python 3.6.0 multiprocessing map_async callback

[Jose Miguel Colella]

Jose Miguel Colella added the comment:

Hello David,
Thanks for your response. Improvements to the documentation could clear this misunderstanding. I had initially believed that after transforming with the function passed to the map, it would use the callback on each of the result arguments. 
Just to understand the use case of the callback. So basically it should not return anything and be a simple print?

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<http://bugs.python.org/issue29108>
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