访问列表中字典的元素

Question

我有一本像这样的字典

elements = {
    "pipelineDescriptionList": [
        {
            "pipelineId": "df-09694461I15A2UPH0RZT",
            "name": "EQUIPMENT_DEV",
            "fields": [
                {
                    "key": "@lastActivationTime",
                    "stringValue": "2020-12-09T05:30:21"
                },
                {
                    "key": "@nextRunTime",
                    "stringValue": "2021-04-12T00:10:00"
                },
                {
                    "key": "@creationTime",
                    "stringValue": "2020-12-09T05:26:06"
                },
                {
                    "key": "@sphere",
                    "stringValue": "PIPELINE"
                },
                {
                    "key": "@healthStatusUpdatedTime",
                    "stringValue": "2021-04-11T00:15:22"
                },
                {
                    "key": "@scheduledStartTime",
                    "stringValue": "2020-12-09T00:10:00"
                },
                {
                    "key": "@healthStatus",
                    "stringValue": "HEALTHY"
                },
                {
                    "key": "@latestRunTime",
                    "stringValue": "2021-04-11T00:10:00"
                },
                {
                    "key": "@version",
                    "stringValue": "1"
                },
                {
                    "key": "name",
                    "stringValue": "EQUIPMENT_DEV"
                },
                {
                    "key": "@id",
                    "stringValue": "df-09694461I15A2UPH0RZT"
                },
                {
                    "key": "@pipelineState",
                    "stringValue": "SCHEDULED"
                },
             
                {
                    "key": "uniqueId",
                    "stringValue": "96AEF597-33FD-420A-8D39-D328EBE0EC1C"
                },
                {
                    "key": "@scheduledPeriod",
                    "stringValue": "1 day"
                },
                {
                    "key": "@firstActivationTime",
                    "stringValue": "2020-12-09T05:30:21"
                }
            ],
            "tags": []
        }
    ]
}

我需要访问键@pipelineState、@nextRunTime、@lastActivationTime 的字符串值。 我目前正在通过

访问它们

elements['pipelineDescriptionList'][0]['fields'][0]['stringValue'] 
elements['pipelineDescriptionList'][0]['fields'][1]['stringValue'] 
elements['pipelineDescriptionList'][0]['fields'][10]['stringValue']

但是我的管道字典不断变化，相同键的索引值对于不同的管道会有所不同。 例如：

elements = {
    "pipelineDescriptionList": [
        {
            "pipelineId": "df-0440555DDFN1Z0N4UOR",
            "name": "API_TOKEN_DEV",
            "fields": [
                {
                    "key": "@creationTime",
                    "stringValue": "2020-09-04T02:11:20"
                },
                {
                    "key": "@cancelActive",
                    "stringValue": "true"
                },
                {
                    "key": "@startTimestamp",
                    "stringValue": "2020-09-08T14:31:29"
                },
                {
                    "key": "pipelineCreator",
                    "stringValue": "AROAU2XMJTS2T67LQAZTF:kiranv@bizcloudexperts.com"
                },
                {
                    "key": "@version",
                    "stringValue": "2"
                },
                {
                    "key": "@id",
                    "stringValue": "df-0440555DDFN1Z0N4UOR"
                },
                {
                    "key": "@lastActivationTime",
                    "stringValue": "2020-09-08T14:31:29"
                },
                {
                    "key": "@nextRunTime",
                    "stringValue": "2021-04-12T02:11:00"
                },
                {
                    "key": "@lastDeactivationRequestTime",
                    "stringValue": "2020-09-05T02:09:29"
                },
                {
                    "key": "@sphere",
                    "stringValue": "PIPELINE"
                },
                {
                    "key": "@healthStatusUpdatedTime",
                    "stringValue": "2021-04-11T02:16:25"
                },
                {
                    "key": "@scheduledStartTime",
                    "stringValue": "2020-09-04T02:11:00"
                },
                {
                    "key": "@healthStatus",
                    "stringValue": "HEALTHY"
                },
                {
                    "key": "@latestRunTime",
                    "stringValue": "2021-04-11T02:11:00"
                },
                {
                    "key": "name",
                    "stringValue": "API_TOKEN_DEV"
                },
                {
                    "key": "@lastDeactivationTime",
                    "stringValue": "2020-09-05T02:11:29"
                },
                {
                    "key": "@pipelineState",
                    "stringValue": "SCHEDULED"
                },
                {
                    "key": "@firstActivationTime",
                    "stringValue": "2020-09-04T02:13:33"
                }
            ]}
    ]
}

如何在不使用索引的情况下访问所需键的字符串值？有没有办法可以直接使用键名来获取 stringValues ？

Answer 1

任何解决方案都需要您搜索（即遍历所有可能的字段）以找到您想要的解决方案。因此，您可能应该通过更新字段来消除该步骤。

for element in elements["pipelineDescriptionList"]:
    element['fields'] = {d['key']:d['stringValue'] for d in element['fields']}

现在您可以访问以下项目：

elements['pipelineDescriptionList'][0]['fields']['@nextRunTime'] 

Answer 2

看来您的主要问题是结构设计不佳。如果您想通过键访问值，请更改您的结构以完全做到这一点：

elements = {
    "pipelineDescriptionList": [
        {
            "pipelineId": "df-09694461I15A2UPH0RZT",
            "name": "EQUIPMENT_DEV",
            "@lastActivationTime": "2020-12-09T05:30:21",
            "@nextRunTime": "2021-04-12T00:10:00",
            ...

这消除了愚蠢的数字索引，让您以更自然的方式访问所需的信息。