auto save

diy1.py

@@ -7,8 +7,9 @@ import turtle
 pen = turtle.Pen()
 screen=turtle.Screen()
 screen.bgcolor("black")
-colors=["red","orange"]
-for i in range(1,300):
+colors=["red","yellow","blue","green"]
+for i in range(1,500):
+    pen.pencolor(colors[i%4])
     pen.forward(i)
     pen.right(91)
 # 隐藏画笔，保存画布