'''Given two segments a and b that are comparable at x, determine whether a is above b or not. Assume that neither segment is vertical '''

p1 = a[0]

p2 = a[1]

p3 = b[0]

p4 = b[1]

x4 = p4[0]

x3 = p3[0]

v1 = (p2[0] - p1[0], p2[1] - p1[1])

v2 = ((x4 - x3) * (p2[0] - p4[0]) + (x4 - x) * (p4[0] - p3[0]), (x4 - x3) * (p2[1] - p4[1]) + (x4 - x) * (p4[1] - p3[1]))

result = v1[0] * v2[1] - v2[0] * v1[1]

if result == 0:

print "a intersects b at the vertical line"

elif result > 0:

print "a is above b"

else: