auto save

py1.py

+import turtle
+pen=turtle.Pen()
+screen=turtle.Screen()
+screen.bgcolor("black")
+color=["green","red","yellow","blue"]
+for i in range(1,300):
+    turtle.pencolor(color[i%4])
+    turtle.forward(i)
+    turtle.right(50)
+pen.hideturtle()
+turtle.done()