save project

diy1.py

@@ -19,9 +19,12 @@ import turtle
 # pen.circle(len,180)
 # pen.forward(2*len)
 # turtle.done()
-distance = 1
+colors = ["red","black","red","black"]
 pen = turtle.Pen()
+screen=turtle.Screen()
+screen.bgcolor("light blue")
 for i in range(1,3000):
+    pen.pencolor(colors[i%4])
     pen.forward(i)
     pen.left(91)
 pen.hideturtle()