save project

diy3.py

 import turtle
+
 pen = turtle.Pen()
+
+screen = turtle.Screen()
+
+screen.bgcolor("black")
+
+c = ["green", "red","orange","yellow"]
+
 for i in range(1,300):
+
+    pen.pencolor(c[i%4])
+
     pen.forward(i)
+
     pen.left(91)
+
 pen.hideturtle()
+
 turtle.done()