python while循环实现

Question

我在下面有这段代码。我想要的是重复raw_input并重复if语句，如果用户提示错误的选项

firewall = raw_input('Please, select IE13PVPNFW01 or IE23PVPNFW01 > ')
if firewall == 'IE13PVPNFW01':
  device = {'IE13PVPNFW01': {'ip': '10.248.40.93'}}
elif firewall == 'IE23PVPNFW01':
  device = {'IE23PVPNFW01': {'ip': '10.42.19.58'}}
else:
  print "Wrong device, options available IE13PVPNFW01 or IE23PVPNFW01"

由于