matrix = [[a, a, a + 1],

              [a, a + 1, a + 2],

              [a + 1, a + 2, a + 2]]

for line in range(0, len(matrix)):

   string = ''

   for item in range(0, len(matrix)):

       string = '%s %s' % (string, matrix[item][line])  

   print(string)