Fix koch example

Author: tannewt

examples/turtle_koch.py

@@ -8,22 +8,23 @@
 
 
 def f(side_length, depth, generation):
-    if depth != 0:
-        side = lambda: f(side_length / 3, depth - 1, generation + 1)
-        side()
-        turtle.left(60)
-        side()
-        turtle.right(120)
-        side()
-        turtle.left(60)
-        side()
+    if depth == 0:
+        turtle.forward(side_length)
+        return
+    side = lambda: f(side_length / 3, depth - 1, generation + 1)
+    side()
+    turtle.left(60)
+    side()
+    turtle.right(120)
+    side()
+    turtle.left(60)
+    side()
 
 
 turtle = turtle(board.DISPLAY)
 
 unit = min(board.DISPLAY.width / 3, board.DISPLAY.height / 4)
 top_len = unit * 3
-print(top_len)
 turtle.penup()
 turtle.goto(-1.5 * unit, unit)
 turtle.pendown()