在python中循环和计算json响应答案

【问题标题】：looping and counting json response in python在python中循环和计算json响应
【发布时间】：2015-01-08 22:41:21
【问题描述】：

我有以下 json 响应：

{

"routers":[
    {
        "status":"ACTIVE",
        "external_gateway_info":{
            "network_id":"4eeac810-19b5-4b9e-82aa-85766506aeec",
            "enable_snat":true,
            "external_fixed_ips":[
                {
                    "subnet_id":"f5d85de1-dd6d-4b56-8ed4-7a2938f6259a",
                    "ip_address":"194.168.0.21"
                }
            ]
        },
        "name":"test_router3",
        "admin_state_up":true,
        "tenant_id":"f19408f548234b71a5052549cb89ae83",
        "distributed":false,
        "routes":{
        },
        "ha":false,
        "id":"102fc36a-e2f7-427f-983d-f71b77be0beb"
    },
    {
        "status":"ACTIVE",
        "external_gateway_info":{
            "network_id":"4eeac810-19b5-4b9e-82aa-85766506aeec",
            "enable_snat":true,
            "external_fixed_ips":[
                {
                    "subnet_id":"f5d85de1-dd6d-4b56-8ed4-7a2938f6259a",
                    "ip_address":"194.168.0.20"
                }
            ]
        },
        "name":"test_router2",
        "admin_state_up":true,
        "tenant_id":"c3a69d0bbc944b1fbb0873efd71189db",
        "distributed":false,
        "routes":{
        },
        "ha":false,
        "id":"11b413a3-975e-491c-b0cf-9e2ab11a17c4"
    },
    {
        "status":"ACTIVE",
        "external_gateway_info":{
            "network_id":"4eeac810-19b5-4b9e-82aa-85766506aeec",
            "enable_snat":true,
            "external_fixed_ips":[
                {
                    "subnet_id":"f5d85de1-dd6d-4b56-8ed4-7a2938f6259a",
                    "ip_address":"194.168.0.18"
                }
            ]
        },
        "name":"test_router0",
        "admin_state_up":true,
        "tenant_id":"82c3cbe17d8e431a945ee972067b4063",
        "distributed":false,
        "routes":{
        },
        "ha":false,
        "id":"17ed98c2-36d3-49ed-b9bb-a51616ae0112"
    },
    {
        "status":"ACTIVE",
        "external_gateway_info":{
            "network_id":"4eeac810-19b5-4b9e-82aa-85766506aeec",
            "enable_snat":true,
            "external_fixed_ips":[
                {
                    "subnet_id":"f5d85de1-dd6d-4b56-8ed4-7a2938f6259a",
                    "ip_address":"194.168.0.19"
                }
            ]
        },
        "name":"test_router1",
        "admin_state_up":true,
        "tenant_id":"9930b010b96b44c8844dcac7e5b15682",
        "distributed":false,
        "routes":{
        },
        "ha":false,
        "id":"68135a8f-a28c-43c3-9609-8a23b7b7452e"
    },
    {
        "status":"ACTIVE",
        "external_gateway_info":{
            "network_id":"4eeac810-19b5-4b9e-82aa-85766506aeec",
            "enable_snat":true,
            "external_fixed_ips":[
                {
                    "subnet_id":"f5d85de1-dd6d-4b56-8ed4-7a2938f6259a",
                    "ip_address":"194.168.0.22"
                }
            ]
        },
        "name":"test_router4",
        "admin_state_up":true,
        "tenant_id":"f844661b3a7d413a8d66a12e77833539",
        "distributed":false,
        "routes":{
        },
        "ha":false,
        "id":"6bbb58df-2699-4428-a95e-de51ed4cb37b"
    },
    {
        "status":"ACTIVE",
        "external_gateway_info":{
            "network_id":"4eeac810-19b5-4b9e-82aa-85766506aeec",
            "enable_snat":true,
            "external_fixed_ips":[
                {
                    "subnet_id":"f5d85de1-dd6d-4b56-8ed4-7a2938f6259a",
                    "ip_address":"194.168.0.3"
                }
            ]
        },
        "name":"external_router1",
        "admin_state_up":true,
        "tenant_id":"c3a69d0bbc944b1fbb0873efd71189db",
        "distributed":false,
        "routes":{
        },
        "ha":false,
        "id":"dd7a4123-4b5a-49df-bc42-db71772cffd0"
    }
]

}

我需要得到以下内容：

整个响应中的“id”计数

请谁能告诉我如何循环遍历 json。

我尝试了 for 循环，但得到错误“整数预期为索引”

【问题讨论】：

你能解释清楚一点吗？

标签： python json for-loop

【解决方案1】：

假设您想要 json 字典的 'routers' 键中的元素数量：

import json
response = json.reads(response) # Given a json string, returns a python dictionary
return len(response['routers'])

【讨论】：

【解决方案2】：

这里有一个 sn-p，它计算路由项的 'id' 属性的出现

>>> import json
>>> json_data = json.loads(raw_json_data)
>>> id_count = sum(1 for route in json_data['routers'] if route.get('id'))
>>> 
>>> id_count
6

【讨论】：