code: def test_save_twice():
      # Issue #100
      t = AnnoyIndex(10, "angular")
      for i in range(100):
          t.add_item(i, [random.gauss(0, 1) for z in range(10)])
      t.build(10)
      t.save("t1.ann")
      t.save("t2.ann")
  
imports: import os
  import random
  import pytest
  from annoy import AnnoyIndex
label_desc: Use image node_id 6 for calling a global function with example usage: test_save_twice() without return types