In this particular case, the Python version on RosettaCode seems insanely overcomplicated. I updated the Julia version to a much simpler implementation (http://rosettacode.org/wiki/Parsing/RPN_calculator_algorithm#Julia).
(As usual, the J version is the one to beat for terseness, at the expense of readability. I have a perverse admiration for the J programmers on RosettaCode.)
