auto save

hzw.py

+import turtle
+screen=turtle.Screen()
+screen.bgcolor("black")        #设置画布的背景颜色
+pen = turtle.Pen()
+pen.speed(10000)
+colors=["red","orange","yellow","green"]    #颜色列表
+for i in range(1,300):
+    pen.forward(i)
+    pen.pencolor(colors[i%4])     #对4取余
+    pen.right(91)
+turtle.done()
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