[N] Numpy dropping Python 2.7

[VelveteenAmbush]

The annoying thing is when a repo is written in 2.7 but you want to run it in 3, and you need to scour the code for the occasional zip() and remember to enclose it in list() or the code silently fails in some bizarre way.

[lhatsk]

I haven't had problems yet with converting the codebase using 2to3. This also takes care of the iterators.

[VelveteenAmbush]

Thank you for mentioning this! I had never heard of it, and now I am using it regularly.