python字典嵌套字典的情况下获取某个key的value

 1 #coding: utf-8
 2 import types
 3 
 4 #获取字典中的objkey对应的值，适用于字典嵌套
 5 #dict:字典
 6 #objkey:目标key
 7 #default:找不到时返回的默认值
 8 def dict_get(dict, objkey, default):
 9     tmp = dict
10     for k,v in tmp.items():
11         if k == objkey:
12             return v
13         else:
14             if type(v) is types.DictType:
15                 ret = dict_get(v, objkey, default)
16                 if ret is not default:
17                     return ret
18     return default
19 
20 #如
21 dicttest={"result":{"code":"110002","msg":"设备设备序列号或验证码错误"}}
22 ret=dict_get(dicttest, ‘msg‘, None)
23 print(ret)