将以下列表的backup_unit_id全部提取出来
示例:
dbs = [{
"backup_unit_id": 163,
"data_node_id": 2,
"attribute": {
"convertor_id": 4,
"channel_num": 2,
"sga": "90G"
}
},
{
"backup_unit_id": 164,
"data_node_id": 3,
"attribute": {
"convertor_id": 9,
"channel_num": 2,
"sga": "90G"
}
}
]
1、确定需要取值的对象是什么类型(列表还是字典)
2、此处确定类型为列表,列表下嵌套了字典
3、所以取值的时候要用到列表取值,字典取值
4、先把列表的值提取出来,也就是通过for…in…进行遍历
5、列表的值提取返回结果为字典类型,所以进一步取值时,通过字典的key获取,例:i[“key”]
代码如下(示例):
dbs = [{
"backup_unit_id": 163,
"data_node_id": 2,
"attribute": {
"convertor_id": 4,
"channel_num": 2,
"sga": "90G"
}
},
{
"backup_unit_id": 164,
"data_node_id": 3,
"attribute": {
"convertor_id": 9,
"channel_num": 2,
"sga": "90G"
}
}
]
for i in dbs:
# print(i)
print(i["backup_unit_id"])
返回结果(示例):
163
164