diff --git a/source/directives/ac_examples/activecode_ex4-fractal.txt b/source/directives/ac_examples/activecode_ex4-fractal.txt
index 840f0f9..5a57942 100644
--- a/source/directives/ac_examples/activecode_ex4-fractal.txt
+++ b/source/directives/ac_examples/activecode_ex4-fractal.txt
@@ -12,45 +12,48 @@
     ~~~~
     import turtle
 
-    def drawTriangle(points,color,myTurtle):
+
+    def drawTriangle(points, color, myTurtle):
         myTurtle.fillcolor(color)
         myTurtle.up()
-        myTurtle.goto(points[0][0],points[0][1])
+        myTurtle.goto(points[0][0], points[0][1])
         myTurtle.down()
         myTurtle.begin_fill()
-        myTurtle.goto(points[1][0],points[1][1])
-        myTurtle.goto(points[2][0],points[2][1])
-        myTurtle.goto(points[0][0],points[0][1])
+        myTurtle.goto(points[1][0], points[1][1])
+        myTurtle.goto(points[2][0], points[2][1])
+        myTurtle.goto(points[0][0], points[0][1])
         myTurtle.end_fill()
 
-    def getMid(p1,p2):
-        return ( (p1[0]+p2[0]) / 2, (p1[1] + p2[1]) / 2)
 
-    def sierpinski(points,degree,myTurtle):
-        colormap = ['blue','red','green','white','yellow',
-                    'violet','orange']
-        drawTriangle(points,colormap[degree],myTurtle)
+    def getMid(p1, p2):
+        return (p1[0] + p2[0])/2, (p1[1] + p2[1])/2
+
+
+    def sierpinski(points, degree, myTurtle):
+        colormap = ['blue', 'red', 'green', 'white', 'yellow',
+                    'violet', 'orange']
+        drawTriangle(points, colormap[degree], myTurtle)
         if degree > 0:
             sierpinski([points[0],
-                            getMid(points[0], points[1]),
-                            getMid(points[0], points[2])],
+                        getMid(points[0], points[1]),
+                        getMid(points[0], points[2])],
                        degree-1, myTurtle)
             sierpinski([points[1],
-                            getMid(points[0], points[1]),
-                            getMid(points[1], points[2])],
+                        getMid(points[0], points[1]),
+                        getMid(points[1], points[2])],
                        degree-1, myTurtle)
             sierpinski([points[2],
-                            getMid(points[2], points[1]),
-                            getMid(points[0], points[2])],
+                        getMid(points[2], points[1]),
+                        getMid(points[0], points[2])],
                        degree-1, myTurtle)
 
-    def main():
-       myTurtle = turtle.Turtle()
-       myWin = turtle.Screen()
-       myPoints = [[-100,-50],[0,100],[100,-50]]
-       sierpinski(myPoints,3,myTurtle)
-       myWin.exitonclick()
 
-    main()
+    def main():
+        myTurtle = turtle.Turtle()
+        myWin = turtle.Screen()
+        myPoints = [[-100, -50], [0, 100], [100, -50]]
+        sierpinski(myPoints, 3, myTurtle)
+        myWin.exitonclick()
 
 
+    main()