Lecture Notes 24 Jul 2013


def main():
  # Create a 2-D list
  a = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]

  # Copy a 2-D list
  b = []
  for row in a:
    c = []
    for col in row:
      c.append(col)
    b.append(c)

  # Find max in a 2-D list
  max = a[0][0]
  for i in range (len(a)):
    for j in range (len(a[i])):
      if (a[i][j] > max):
        max = a[i][j]

  # Find the sum of each row and print
  for row in a:
    sum = 0
    for col in row:
      sum = sum + col
    print (sum)

  # Find the total sum and print
  sum = 0
  for row in a:
    for col in row:
      sum = sum + col
  print (sum)

  # Find the sum of each col and print
  num_col = len (a[0])
  for j in range (num_col):
    sum_col = 0
    for i in range (len(a)):
      sum_col = sum_col + a[i][j]
    print (sum_col)

  # Find the sum of the diagonals in a square 2-D list
  sum_lr = 0
  sum_rl = 0
  for i in range (len(a)):
    sum_lr = sum_lr + a[i][i]
    sum_rl = sum_rl + a[i][len(a) - 1 - i]
  print (sum_lr, sum_rl)

  # Transpose a 2-D list
  b = []
  for j in range (len (a[0])):
    c = []
    for i in range (len(a)):
      c.append (a[i][j])
    b.append (c)

main()