save project

diy1.py

@@ -4,8 +4,11 @@
 """
 import turtle
 pen=turtle.Pen()
-
+screen=turtle.Screen()
+screen.bgcolor("black")
+a=["red","yellow","orange","green"]
 for i in range(500):
+    pen.pencolor(a[i%4])
     pen.forward(i)
     pen.right(91)