auto save

diy1.py

+import turtle
+c=['red','blue','green','yellow']
+pen = turtle.Pen()
+pen.speed(1000)
+for i in range(1,300):
+    pen.color(c[i%4])
+    pen.forward(i)
+    pen.right(92)
+# 隐藏画笔，保存画布
+pen.hideturtle()
+turtle.done()