new_contents: #!/usr/bin/env python
  
  import threading
  
  import spam
  
  
  def grab_cores(threads=1, count=int(1e9)):
      _threads = []
      for i in range(threads):
          thread = threading.Thread(target=spam.busy, args=(count,))
          _threads.append(thread)
          thread.start()
      for thread in _threads:
          thread.join()
  
  
  if __name__ == '__main__':
      import sys
  
      grab_cores(threads=int(sys.argv[1]))
  
subject: Use threading.Thread to call spam.busy