[masklinn]

> - I like lambda a, b: a + b syntax better than lambda a_b: a_b[0] + a_b[1]

That works perfectly well in Python 3, you're thinking about `lambda (a, b)` aka `def foo((a, b))` aka tuple-parameter unpacking.

> - I prefer map/reduce/filter to return lists rather than iterable

1. why? 2. just wrap them in a list() call?

> - I prefer dict.keys/values/items to return sets/lists rather than iterables, unless I call dict.iter[keys/values/items]

You are aware that Python3's keyviews and itemsviews are sets but P2's are just lists right?