python字典嵌套字典的情况下找到某个key的value详解

#coding: utf-8import types#获取字典中的objkey对应的值，适用于字典嵌套#dict:字典#objkey:目标key#default:找不到时返回的默认值def dict_get(dict, objkey, default):  tmp = dict  for k,v in tmp.items():    if k == objkey:      return v    else:      if type(v) is types.DictType:        ret = dict_get(v, objkey, default)        if ret is not default:          return ret  return default#如dicttest={"result":{"code":"110002","msg":"设备设备序列号或验证码错误"}}ret=dict_get(dicttest, 'msg', None)print(ret)