auto save

my_tree.py

@@ -11,5 +11,10 @@ pen.left(90)
 pen.up()
 pen.backward(150)    # 后退
 pen.down()
-
+pen.fd(100)
+pen.rt(30)
+pen.fd(50)
+pen.backward(50)
+pen.lt(60)
+pen.fd(50)
 turtle.done()