save project

my_tree.py

@@ -12,15 +12,15 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 def tree(n):
-    if n>=50:
+    if n>=20:
         pen.forward(n)
         pen.right(30)
-        tree(n-50)
+        tree(n-20)
         pen.left(60)
-        tree(n-50)
+        tree(n-20)
         pen.right(30)
         pen.penup()
         pen.backward(n)
         pen.pendown()
-tree(150)
+tree(125)
 turtle.done()