save project

diy2.py

 import turtle
 pen = turtle.Pen()
-# 请创造师在下面接着创
+screen=turtle.Screen()
+screen.bgcolor("black")
+colors=("red","blue","green","cyan")
 for i in range(1,300):
+    pen.pencolor(colors[i%4])
     pen.forward(i)
     pen.left(91)
-# 隐藏画笔，保存画布
 pen.hideturtle()
 turtle.done()
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