save project

my_tree.py

@@ -11,5 +11,11 @@ pen.left(90)
 pen.up()
 pen.backward(150)    # 后退
 pen.down()
-
+pen.backward(-150)
+pen.left(30)
+pen.backward(-50)
+pen.backward(50)
+pen.right(60)
+pen.backward(-50)
+pen.backward(50)
 turtle.done()