save project

diy1.py

@@ -4,12 +4,14 @@
 """
 import turtle
 pen = turtle.Pen()
-screen=
-screen.
-color=["red","blue","orange","yellow"]
+screen=turtle.Screen()
+screen.bgcolor("black")
+colors=["red","blue","orange","yellow"]
 pen.speed(0)
 for i in range(1,300):
+
     pen.forward(i)
+    pen.color(colors[i%4])
     pen.right(91)
 # 隐藏画笔，保存画布
 pen.hideturtle()