How many squares question...

main.py

# http://www.quora.com/Puzzle-and-Trick-Questions/How-many-squares-are-in-this-picture

def get_square_count(length):
  squares = 0
  nb_nodes = length ** 2
  for i in range(nb_nodes):
    tmp = i + 1
    while tmp % 5 != 0 and tmp + ((tmp - i) * length) < nb_nodes:
      tmp += 1
      squares += 1
  return squares

print 'Response: %s' % (get_square_count(5) + 2 * get_square_count(3))
# Response: 40