save project

diy2.py

 import turtle
 pen = turtle.Pen()
+screen = turtle.Screen()
+screen.bgcolor("black")
+color = ("red","orange","yellow","green")
 for i in range(1,300):  #range(start=0,stop,step=1)
+    pen.pencolor(color[i%4])
     pen.forward(i)
     pen.right(91)
 pen.hideturtle()