Problem 7b.

#gradient
def sum (x, y):
 while x>0:
  y=x+y
  x=x-1
  if x==0:
   return y
def grad (a):
 for x in range (1,a):
  y=100-int(.5*sum(x, 0))
  print y
  g.line (0,0,0,100)
  g.line (y,0,y,100)
grad (20)

-gary escudero