save project

my_tree.py

@@ -11,20 +11,18 @@ pen.left(90)
 pen.up()
 pen.up()
 pen.backward(150)    # 后退
 pen.backward(150)    # 后退
 pen.down()
 pen.down()
-pen.forward(100)
+
 def tree(n):
 def tree(n):
     if n>=0:
     if n>=0:
         pen.forward(n)
         pen.forward(n)
         pen.right(30)
         pen.right(30)
         tree(n-10)
         tree(n-10)
-        pen.forward(100)
         pen.left(60)
         pen.left(60)
         tree(n-10)
         tree(n-10)
-        pen.forward(100)
         pen.right(30)
         pen.right(30)
-        pen.forward(100)
         pen.up()
         pen.up()
-        pen.bckward(n)
+        pen.backward(n)
         pen.down()
         pen.down()
+tree(60)
 turtle.done()
 turtle.done()