auto save

my_tree.py

@@ -12,16 +12,14 @@ pen.up()
 pen.backward(150)    # 后退
 pen.backward(150)    # 后退
 pen.down()
 pen.down()
 
 
-pen.forward(100)
+pen.forward(n)
 pen.right(30)
 pen.right(30)
-pen.forward(50)
-pen.back(50)
+t(n-50)
 pen.left(60)
 pen.left(60)
-pen.forward(50)
-pen.back(50)
+t(n-50)
 pen.right(30)
 pen.right(30)
 pen.up()
 pen.up()
-pen.back(100)
+pen.backward(100)
 pen.down()
 pen.down()