Terry J. Reedy <tjre...@udel.edu> added the comment:

Showing both was the intent of my comment. Since I am about 60:40 on that, I 
was and am  willing for you, having grabbed and pushed the issue, to drop the 
half-expanded version if you thought it better. With or without, we have 
improved this section. But I still think showing the intermediate step adds 
sufficient extra clarity to be worth the 5 or 6 extra lines. While nested list 
comps are not scary, they can, as I discovered, be confusing with a rushed 
reading. Anyone who wants to compress nested append loops should also do it in 
two steps.

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<http://bugs.python.org/issue13549>
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