如何在 Python 中查询复杂的嵌套 JSON 数据

Question

我有以下 JSON 数据，它是 AWS“cli 描述 ec2 数据”输出的缩短版本。

我需要使用 Python 以便查询 InstanceId 值并获取其所有 VolumeId 值（可能有 1 个以上的条目）及其 PrivateIpAddress 值。

输出看起来像这样：

   i-01,10.1.1.1,vol-123,vol-456
   i-02,10.2.2.2,vol-789

我是 Python 新手，似乎无法找到有关如何执行此操作的答案。 任何人都可以帮忙吗？

{
"Reservations": [
    {
        "Instances": [
            {
                "InstanceId": "i-01",
                "PrivateIpAddress": "10.1.1.1", 
                "BlockDeviceMappings": [
                     {
                        "DeviceName": "/dev/sda", 
                        "Ebs": {
                            "Status": "attached", 
                            "VolumeId": "vol-123", 
                        }
                    }, 
                    {
                        "DeviceName": "/dev/sdb", 
                        "Ebs": {
                            "Status": "attached", 
                            "VolumeId": "vol-456", 
                        }
                    }
                ], 
                "Tags": [
                    {
                        "Value": "Server01", 
                        "Key": "Name"
                    }
                ], 
                "AmiLaunchIndex": 0
            }
        ], 
        "OwnerId": "123456789"
    }, 
    {
        "Instances": [
            {
                "InstanceId": "i-02",
                "PrivateIpAddress": "10.2.2.2", 
                "BlockDeviceMappings": [
                     {
                        "DeviceName": "/dev/sda", 
                        "Ebs": {
                            "Status": "attached", 
                            "VolumeId": "vol-789", 
                        }
                    }
                ], 
                "Tags": [
                    {
                        "Value": "Server02", 
                        "Key": "Name"
                    }
                ], 
                "AmiLaunchIndex": 0
            }
        ], 
        "OwnerId": "123456789"
    }
]

}

Answer 1

result = []
for reservation in d["Reservations"]:
    res = {}
    instances = reservation["Instances"][0]
    res['InstanceID'] = instances['InstanceId']
    res['PrivateIpAddress'] = instances['PrivateIpAddress']
    res['BlockDeviceMappings'] = []
    for blockdevice in instances['BlockDeviceMappings']:
        res['BlockDeviceMappings'].append(blockdevice['Ebs']['VolumeId'])
    result.append(res)

然后你可以这样做：

final_df = pd.DataFrame(result)

以漂亮的方式显示结果。