save project

diy1.py

@@ -3,18 +3,14 @@
 每次动都增加画笔移动的长度，并旋转91°，重复执行300次，查看效果
 """
 import turtle
-
 pen = turtle.Pen()
-
+a=turtle.Screen()
+a.bgcolor("black")
+z=["red","yellow","blue","green"]
 pen.speed(1000)
 for i in range(300):
+    pen.color(z[i%4])
     pen.forward(i)
     pen.right(91)
-
-# 请创造师在下面接着创作C
-
-
-
-# 隐藏画笔，保存画布
 pen.hideturtle()
 turtle.done()