code: def is_newer_than(pth1, pth2):
      
  
      return not os.path.exists(pth1) or not os.path.exists(pth2) or \
         os.stat(pth1).st_mtime > os.stat(pth2).st_mtime
docs: Return true if either file pth1 or file pth2 don't exist, or if
      pth1 has been modified more recently than pth2