save project

diy1.py

@@ -3,13 +3,13 @@
 每次移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
-
+turtle.bgcolor("black")
 pen = turtle.Pen()
 pen.speed(0)
 # 请创造师在下面接着创作
-
+a=["green","red","yellow","blue"]
 for i in range(1,1000):
-    pen.pencolor("red")
+    pen.pencolor(a[i%4])
     pen.forward(i)
     
     pen.right(91)