Python JSON解析处理缺少的值

我正在使用Python3，只存储JSON负载中所需的数据，有时负载不一致，并且存储的值可能不存在。当所有值都存在于有效负载中，共享一个示例数据和代码时，我的代码工作正常。当有效负载中不存在值时，我希望分配Null或None。谁能帮我解决这个问题。
样本数据

data = 
{
            "Session": {
                "@displayName": "1212",
                "@id": 1212,
                "anchorIpAddress": {
                    "address": "0.0.0.0"
                },
                "apMacAddress": {
                    "octets": "111111111"
                },
                "algorithm": "OPENSYSTEM",
                "bytesReceived": 1000,
                "bytesSent": 100
            }
        },
        {
            "Session": {
                "@displayName": "1111",
                "@id": 1111,
                "anchorIpAddress": {
                    "address": "0.0.0.0"
                },
                "algorithm": "OPENSYSTEM",
                "bytesReceived": 234,
                "bytesSent": 20
            }
        },
        {
            "Session": {
                "@displayName": "1313",
                "@id": 1313,
                "apMacAddress": {
                    "octets": "14312312"
                },
                "algorithm": "OPENSYSTEM",
                "bytesReceived": 39735,
                "bytesSent": 8308
            }
        }
}  

代码

        clients = json.loads(json.dumps(data, indent=2))
        client1 = {}

    for client in clients:
        client1["display"] = client['Session']['@display']
        client1["id"] = client['Session']['@id']
        client1["anchorIpAddress"] = client['Session']['anchorIpAddress']['address']
        client1["apMacAddress"] = client['Session']['apMacAddress']['octets']
        print(client1)  

错误

   client1["apMacAddress"] = client['clientSessionsDTO']['apMacAddress']['octets']
   KeyError: 'apMacAddress'  

预期结果

{
display: 1212,
id: 1212,
anchorIpAddress: "0.0.0.0",
apMacAddress: "111111111"
},
{
display: 1212,
id: 1212,
anchorIpAddress: "0.0.0.0",
apMacAddress: Null
},
{
display: 1313,
id: 1313,
anchorIpAddress: Null,
apMacAddress: "14312312"
}

也许吧

你能帮忙吗

client1["apMacAddress"] = client.get('clientSessionsDTO',{}).get('apMacAddress',{}).get('octets', None)