For the following software code, how can you arrange validation and verification :

numbers = [[4, 3], [1,2], [154,233], [555,-444]]

def show_add_pair(pair): print str(pair[0]) + '+' + str(pair[1]) + '= ' + str(pair[0] + pair[1])

print ' Part 1' print '4+3=',4+3 print '1+2=',1+2 print '154+233=',154+233 print '555+-444=',555+(-444)

print ' Part 2' show_add_pair(numbers[0]) show_add_pair(numbers[1]) show_add_pair(numbers[2]) show_add_pair(numbers[3])

print ' Part 3' for n in numbers: show_add_pair(n)

print ' Part 4' map(show_add_pair, numbers)