File: class/Workbook/Examples/Lecture13/summer.py

import sys

def summer(numCols, fileName):
    sums = [0] * numCols 
    for line in open(fileName):
        cols = line.split()
        for i in range(numCols): 
            sums[i] += eval(cols[i])         # any expr wil work!
    return sums

if __name__ == '__main__':
    print summer(eval(sys.argv[1]), sys.argv[2])



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