docs: def delete_guest(userid):
      """ Destroy a virtual machine.
  
      Input parameters:
      :userid:            USERID of the guest, last 8 if length > 8
      """
      # Check if the guest exists.
      guest_list_info = client.send_request('guest_list')
      # the string 'userid' need to be coded as 'u'userid' in case of py2 interpreter.
      userid_1 = (unicode(userid, "utf-8") if sys.version[0] == '2' else userid)
  
      if userid_1 not in guest_list_info['output']:
          RuntimeError("Userid %s does not exist!" % userid)
  
  
      # Delete the guest.
      guest_delete_info = client.send_request('guest_delete', userid)
  
      if guest_delete_info['overallRC']:
          print("\nFailed to delete guest %s!" % userid)
      else:
          print("\nSucceeded to delete guest %s!" % userid)