save project

my_tree.py

@@ -12,15 +12,8 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 
-pen.down()
-pen.forward(100)
-pen.right(30)
-pen.forward(50)
-pen.backward(50)
-pen.left(60)
-pen.forward(50)
-pen.up()
-pen.backward(50)
-pen.right(30)
-pen.backward(100)
+def tree(n):
+    pen.forward(n)
+    pen.right(30)
+    tree(n-50)
 turtle.done()