auto save

star.py

 import turtle
-open=turtle.pen()
-For i in range(5)
-   pen.forward(200)
-   pen.right(144)
-   pen.hideturtle()
-pen.done()
-   
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+
+p=turtle.Pen()
+p.speed(20)
+s=turtle.Screen()       #定义画布
+s.bgcolor("black")      #设置画布背景颜色
+color=["red","orange","blue","yellow","green"]      #存储颜色
+
+for i in range(500):
+   p.pencolor(color[i%4])         #每次边的颜色
+   p.forward(i)       #每次前进的距离
+   p.right(91)         #每次旋转的角度
+
+p.hideturtle()       #隐藏画笔
+turtle.done()        #保留画布
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