auto save

my_tree.py

@@ -11,5 +11,7 @@ pen.left(90)
 pen.up()
 pen.up()
 pen.backward(150)    # 后退
 pen.backward(150)    # 后退
 pen.down()
 pen.down()
+pen.up()
+pen.write(100)
 
 
 turtle.done()
 turtle.done()