text: import gevent
  
  def calc(a):
      x = 0
      for i in range(1000000):
          x += 1
      gevent.sleep(a)
  
  g1 = gevent.spawn(calc, 1)
  g2 = gevent.spawn(calc, 2)
  g3 = gevent.spawn(calc, 3)
  g1.start()
  g2.start()
  g3.start()
  g1.join()
  g2.join()
  g3.join()
  