save project

diy1.py

@@ -2,16 +2,17 @@
 使用turtle模块画图
 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
 """
-a=91
-s=100
-
+a=92
+b=["red","blue","yellow","green"]
 import turtle
 pen=turtle.Pen()
+screensize=turtle.Screen()
+screensize.bgcolor("black")
 pen.left(90)
-for i in range(300):
-    pen.forward(s)
+for i in range(0,300):
+    pen.pencolor(b[i%4])
+    pen.forward(i)
     pen.right(a)
-    s+=-1