Adjust (for) to just use itertools.product
Adjust (for) to just use itertools.product

 This is to avoid nesting in for loops, helping make clear
 what (break) and (else) do.

 This commit is hereby dedicated to @nedbat

Foxboron/hy,tianon/hy,jakirkham/hy,michel-slm/hy,freezas/hy,zackmdavis/hy,tianon/hy,Tritlo/hy,tuturto/hy,larme/hy,ALSchwalm/hy,adamfeuer/hy,kirbyfan64/hy,kirbyfan64/hy,farhaven/hy,tianon/hy,farhaven/hy,gilch/hy,paultag/hy,timmartin/hy,larme/hy,aisk/hy,aisk/hy,aisk/hy,Foxboron/hy,algernon/hy,larme/hy,farhaven/hy,kartikm/hy,mtmiller/hy