organize and discuss how to do verification and validation of the following code:

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)