GNUPlot 001: Postscript postproduction

I generated a graph with gnuplot:
Settings were:

 set terminal postscript
 set output 'outfile.ps'
 set size 0.6,0.6
 set xlabel "Reaction Coordinate"
 set ylabel "dE[kcal/mol]"
 plot 'data.dat' with lines lw 4
 set output

If i open this file in preview, the file is oriented 90° counter-clock wise. This can be fixed with 'ps2eps'.
The command I used was:

ps2eps -f -R + -B -l data.eps

Python 003: Summing specific items of nested lists

Say we're faced with the challenge of summing the last element of a list of nested lists.
An example might be

a=[[2,4,6],
   [4,2,5],
   [2,5,6]]

where we're interested in the sum of 6+5+6. In Python this can conveniently be done using the reduce/lambda pair of functions:

>>> reduce(lambda x,y: x+y, [i[-1] for i in a])
17
>>>