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graphs slope fields with color. change the string in the bottom line to the derivative to be displayed.

from math import *
from kandinsky import *

global x
global y

def hcolor(h):
  h/=360
  r=255*(1,2-6*h,0,6*h-4)[((0<=h and h<1/6) or (5/6<=h and h<=1),1/6<=h and h<1/3,1/3<=h and h<2/3, 2/3<=h and h<5/6).index(True)]
  g=255*(6*h,1,4-6*h,0)[(0<=h and h<1/6,1/6<=h and h<1/2,1/2<=h and h<2/3,2/3<=h and h<=1).index(True)]
  b=255*(0,6*h-2,1,6-6*h)[(0<=h and h<1/3,1/3<=h and h<1/2,1/2<=h and h<5/6,5/6<=h and h<=1).index(True)]
  return color(int(r),int(g),int(b))

def run(d):
  global x
  global y
  y=56
  for gy in range(0,111):
    x=-80
    for gx in range(0,160):
      try:
        h=(atan2(eval(d),1) + pi/2)/pi*360
      except ZeroDivisionError:
        h=0
      c=hcolor(h)
      for k in range(gy*2,gy*2+2):
        for h in range(gx*2,gx*2+2):
          set_pixel(h,k,c)
      x+=1
    y-=1

run("x/y")