How do I calculate the mean of a column

Question

Anyone know how can I calculate the mean of one these columns (on linux)??

sda               2.91    20.44    6.13    2.95   217.53   186.67    44.55     0.         


        

Answer 1

David Zaslavsky for the fun of it:

with open("mean.txt", 'r') as f: 
    n,t = map(sum, zip(*((1, float(line.split()[1])) for line in f)))
print t/n