save project

my_tree.py

@@ -7,14 +7,16 @@ w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 def tree(n):
     if n>=50:
+        pen.pendown()
         pen.forward(n)
         pen.right(30)
-        tree(n-50)
+        tree(n-10)
         pen.left(60)
-        tree(n-50)
+        tree(n-10)
         pen.right(30)
         pen.backward(n)
-# 移动到起点
+        pen.penup()
+
 pen.left(90)
 pen.up()
 pen.backward(150)    # 后退