knotta!

knot.py

@@ -0,0 +1,35 @@
+
+class K(object):
+    def __init__(self, s="FLFRFLFRFLFRFLFRFLFRFLF", i=1):
+        self.kf = s
+        self.i = i
+
+    def __xor__(self, o):
+        return K(self.kf.replace("F", "FLFRFLF"), self.i+1)
+
+    def __nonzero__(self):
+        import turtle
+        k_ = turtle.Turtle()
+        turtle.resetscreen()
+        turtle.title("Iteration: %d" % self.i)
+        k_.ht()
+        turtle.setup(400, 400)
+        k_.down()
+        k_.speed('fastest')
+        k_.penup()
+        k_.goto(-150, 100)
+        k_.pendown()
+        for move in self.kf:
+            if move == "F":
+                k_.forward(100.0 / (3 ** (self.i - 1)))
+            elif move == "L":
+                k_.left(60)
+            elif move == "R":
+                k_.right(120)
+
+        return 0
+
+
+k = K()
+
+

knotta.py

@@ -0,0 +1,5 @@
+from knoth import k
+not k ^ k
+#not k ^ k ^ k
+import turtle; turtle.done()
+