text: import os
  from time import sleep
  
  print('***********************')
  a = 1
  
  pid = os.fork()
  
  if pid < 0:
      print("创建进程失败")
  elif pid == 0:
      print('这是新的进程')
      print("a =",a)
      a = 10000
  else:
      sleep(1)
      print("这是原有进程")
      print("psarent a =",a)
  
  print("演示完毕")
  