auto save

my_tree.py

 import turtle
-ii
 
 pen = turtle.Turtle()
 pen.color('sienna')
@@ -7,7 +6,8 @@ pen.color('sienna')
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 
-
+# 移动到起点
+def 
 pen.left(90)
 pen.up()
 pen.backward(150)    # 后退