save project

diy1.py

@@ -3,11 +3,14 @@
 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
-
+screen=turtle.Screen()
+screen.bgcolor("black")
 pen = turtle.Pen()
+c=["red","yellow","green","blue"]
 # 请创造师在下面接着创作
 pen.speed(0)
 for i in range(300):
+    pen.pencolor(c[i%4])
     pen.forward(i)
     pen.right(91)
 # 隐藏画笔，保存画布