Comment by justinmk

I'd really like to see the video for these slides. But here's what caught my interest:

    Set and dict comprehensions
    {x**2 for x in range(10)}
    {x: x**2 for x in range(10)}

    Why reduce() must die:
    ... the applicability of reduce() is pretty much limited
    to associative operators, and in all other cases it's 
    better to write out the accumulation loop explicitly.

    int [divided by] int should return float

    nonlocal

Explicit nonlocal variable modifier which (I guess) "promotes" the variable outside its local scope. Kind of the inverse of Java requiring 'final' to bind a variable to a closure.