auto save

diy1.py

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