save project

diy1.py

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