auto save

1114.py

 import turtle
 import turtle
 pen=turtle.Pen()
 pen=turtle.Pen()
-i=1
+screen=turtle.Screen()
+screen.bgcolor("black")
 pen.speed(500)
 pen.speed(500)
-for i in range(500):
+color=["red","yellow","blue","green"]
+for i in range(1,500):
+    pen.pencolor(color[i%4])
     pen.forward(i)
     pen.forward(i)
     pen.right(91)
     pen.right(91)
-    i+=1
 pen.hideturtle()
 pen.hideturtle()
 turtle.done()
 turtle.done()
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