save project

diy1.py

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