save project

my_tree.py

@@ -12,19 +12,16 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 pen.pensize(5)
-def s():
-  pen.forward(100)
+def s(n):
+  if n>=50:
+        pen.forward(n)
         pen.right(30)
-  pen.forward(50)
+        s(n-10)
         pen.up()
-  pen.backward(50)
-  pen.down()
         pen.left(60)
-  pen.forward(50)
-  pen.up()
-  pen.backward(50)
+        s(n-10)
         pen.right(30)
-  pen.backward(100)
+        pen.backward(n)
         pen.down()
 s()