auto save

da.py

+import turtle
+
+#设置画布
+screen=turtle.Screen()
+screen.bgcolor("black")
+#创建画笔
+pen=turtle.Pen()
+pen.speed(0)
+colors=["red","orange","yellow","green"]
+for i in range(1,300):
+    pen.color(colors[i%4])
+    pen.forward(i)
+    pen.right(91)
+pen.hideturtle()
+turtle.done()
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