auto save

my_tree.py

@@ -9,18 +9,22 @@ w.bgcolor('wheat')      # wheat小麦
 # 移动到起点
 pen.left(90)
 pen.up()
-pen.backward(150)    # 后退
+pen.backward(150)   
+# 后退
 pen.down()
-
-pen.forward(100)  #主树干
-pen.right(30)     #右树干
+pen.forward(100)
+#主树干
+pen.right(30)
+#右树干
 pen.forward(50)
 pen.penup()
 pen.forward(-50)
 pen.pendown()
-pen.left(60)      #左树干
+pen.left(60)     
+#左树干
 pen.forward(50)
-pen.penup()       #返回
+pen.penup()      
+#返回
 pen.forward(-50)
 pen.right(30)
 pen.forward(-100)