字典'update'方法

Question

我有一个脚本可以构建多个词典并将它们合并为一个词典以 return 到调用实体。要求是将每个字典附加到前一个字典的末尾。当我在我的电脑上构建它时（Windows 10，python 3.x），它运行良好，如下所示。

{
  "Array Name": "SU73ARWVSPF01",
  "storageSystemId": "22186",
  "storageSystemName": "POD5_SU73ARWVSPF01",
  "accessible": true,
  "model": "VSP G1500",
  "svpIpAddress": "10.185.35.37",
  "firmwareVersion": "80-06-78-00/00",
  "lastRefreshedTime": "2020-12-21 14:45:31",
  "Pool List": {
     "Pool-1": {
      "storagePoolId": 11,
      "label": "DATA",
      "capacityInBytes": 590323982008320,
      "usedCapacityInBytes": 422152148877312,
      "availableCapacityInBytes": 168171833131008,
      "usedSubscription": 83
    },
      "Pool-2": {
      "storagePoolId": 12,
      "label": "LOGS",
      "capacityInBytes": 28142827732992,
      "usedCapacityInBytes": 21991601995776,
      "availableCapacityInBytes": 6151225737216,
      "usedSubscription": 78
    }
  },
  "SNMP Manager List": {
    "SNMP-1": {
      "name": "Test",
      "ipAddress": "1.1.1.1"
    },
    "SNMP-2": {
      "name": "Test1",
      "ipAddress": "2.2.2.2"
    }
   },
  "Hardware Alert List": {
    "diskAlerts": false,
    "powerSupplyAlerts": false,
    "batteryAlerts": false,
    "fanAlerts": false,
    "portAlerts": false,
    "cacheAlerts": false,
    "memoryAlerts": false,
    "processorAlerts": false
  }
}

但是，将其移动到实际程序所在的服务器后运行（RHEL 7，python 2.7），字典的顺序变得混乱，如下所示。

{
  "accessible": true,
  "storageSystemName": "POD5_SU73ARWVSPF01",
  "Hardware Alert List": {
    "cacheAlerts": false,
    "powerSupplyAlerts": false,
    "portAlerts": false,
    "processorAlerts": false,
    "batteryAlerts": false,
    "diskAlerts": false,
    "fanAlerts": false,
    "memoryAlerts": false
  },
  "SNMP Manager List": {
    "SNMP-1": {
      "ipAddress": "1.1.1.1",
      "name": "Test"
    },
    "SNMP-2": {
      "ipAddress": "2.2.2.2",
      "name": "Test1"
    }
  },
  "svpIpAddress": "10.185.35.37",
  "storageSystemId": "22186",
  "Array Name": "SU73ARWVSPF01",
  "lastRefreshedTime": "2020-12-21 21:45:31",
  "model": "VSP G1500",
  "Pool List": {
    "Pool-2": {
      "usedSubscription": 78,
      "label": "LOGS",
      "usedCapacityInBytes": 21991601995776,
      "storagePoolId": 12,
      "availableCapacityInBytes": 6151225737216,
      "capacityInBytes": 28142827732992
    },
    "Pool-1": {
      "usedSubscription": 83,
      "label": "DATA",
      "usedCapacityInBytes": 422152148877312,
      "storagePoolId": 11,
      "availableCapacityInBytes": 168171833131008,
      "capacityInBytes": 590323982008320
    }
  },
  "firmwareVersion": "80-06-78-00/00"
}

第一个的输出是我想要的和编程的方式，使用

OUTPUT={}
OUTPUT.update(new Dict1), OUTPUT.update(new Dict2).... etc

有没有办法避免字典插入到另一个字典的中间而不是最后

Answer 1

Python 保持插入顺序的字典只是一个特性since Python 3.6 (although they were only an implementation detail back then; alternative Python implementations didn't have to adhere to this). Starting from Python 3.7，这已成为一种语言规范。

因为您在服务器上使用 Python 2.7，所以使用默认 dict class 不能保证字典顺序。您可以使用 collections.OrderedDict class 来确保记住插入顺序。

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