save project

diy2.py

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