如果密钥对匹配，则从 json 返回/获取值 - Python答案

【问题标题】：Return/obtain values from json if keypair matches - Python如果密钥对匹配，则从 json 返回/获取值 - Python
【发布时间】：2021-03-12 04:32:21
【问题描述】：

目前，我可以使用其 api 从网站中提取硬盘状态列表。 我想精简我的结果，并从我的结果中返回密钥对“status”：“Degraded”或“status”：“Pred Fail”的数据。

这是没有任何解析的 json 的样子：

{
  "results": [
    {
      "bytesPerSector": 512,
      "description": "SSD",
      "interfaceType": "RAID",
      "manufacturer": "UNKNOWN",
      "mediaType": "Fixed hard disk media",
      "model": "OEM Genuine 500GB",
      "name": "\\\\.\\PHYSICALDRIVE0",
      "partitionCount": 1,
      "serialNumber": "Notputting that in here",
      "size": 500105249280,
      "smartCapable": true,
      "status": "OK",
      "deviceId": taking this out as well,
      "timestamp": 1573080987.0
    },

目前，我已将结果精简为仅显示 ['interfaceType'],['manufacturer'],['model'],['status'];但是，我只想提取具有 ['status':'Degraded'] 或 ['status':'Pred Fail'] 作为硬盘驱动器状态的部分。（如果这有意义？）

这是我目前的代码：

alerts = ''
for i in range (len(napialert['results'])):
    ninjainterfaceType_str = json.dumps(napialert['results'][i]['interfaceType'], indent=2,)
    ninjamanufacturer_str = json.dumps(napialert['results'][i]['manufacturer'], indent=2,)
    ninjamodel = json.dumps(napialert['results'][i]['model'], indent=2,)
    ninjastatus = json.dumps(napialert['results'][i]['status'], indent=2,)
    alerts += (ninjainterfaceType_str + "\n" + ninjamanufacturer_str + "\n" + ninjamodel + "\n" + ninjastatus + "\n _____________________________\n")
    
print("Here are a list of Hard drive with manufacturer problems: " + alerts)

这是结果（但它会打印所有结果，而不仅仅是那些有故障状态的结果）：

Here are a list of Hard drive with manufacturer problems: "RAID"
"UNKNOWN"
"OEM Genuine 500GB"
"OK"
 _____________________________
"SATA"
"Western Digital"
"WDC WD1502FAEX-007BA0"
"OK"
 _____________________________
"SATA"
"UNKNOWN"
"ADATA SP550"
"OK"

More below this...

如果有人有任何想法或建议可以尝试，请告诉我。

【问题讨论】：

标签： python json for-loop parsing

【解决方案1】：

你没有做任何事情来实际检查状态...？

您的for 循环也很奇怪；因为您不关心列表中有多少项或当前项的索引，所以只需遍历项目本身，而不是列表索引的范围。

for res in napialert['results']:
    if res['status'] in ('Degraded', 'Pred Fail'):
        for attr in ('interfaceType', 'manufacturer', 'model', 'status'):
            print(res[attr])

我也认为没有理由将字符串收集到一个列表中，并且仅在我们基本上将程序的内存消耗增加一倍（不，等待，三倍）时才打印。找到匹配项后立即打印，然后继续下一个。将每个单独的字符串转换回 JSON（即有效地在其周围添加双引号）的怪异舞蹈似乎也是多余的，但如果它确实增加了价值，当然很容易放回去。

【讨论】：

这完全适合我！我将您的答案作为正确答案，因为它更有效。我只是在学习 python，所以就效率而言，我的技术很糟糕，但我将它放入字符串的原因是因为我将使用 tkinter 使应用程序图形化。所以我有一些"n\" + "__________" + "n\" 让它在 tkinter 中看起来更好。可能有比这更好的方法，但我会尽快研究。再次感谢您。

【解决方案2】：

我看到了几个潜在的问题，第一个可能是你得到的 json 对象的格式，它可能需要被剥离，也许你的 API 实际上是正确返回的，如果这是案例只是对状态属性进行实际检查，您可以在下面找到一个示例，使用数组并检查当前对象的状态是否在该数组中：

import json

napialert = {
  "results": [
    {
      "bytesPerSector": 512,
      "description": "SSD",
      "interfaceType": "RAID",
      "manufacturer": "UNKNOWN",
      "mediaType": "Fixed hard disk media",
      "model": "OEM Genuine 500GB",
      "name": "\\\\.\\PHYSICALDRIVE0",
      "partitionCount": 1,
      "serialNumber": "Notputting that in here",
      "size": 500105249280,
      "smartCapable": True,
      "status": "OK",
      "deviceId": "taking this out as well",
      "timestamp": 1573080987.0
    },
        {
      "bytesPerSector": 512,
      "description": "SSD",
      "interfaceType": "RAID",
      "manufacturer": "UNKNOWN",
      "mediaType": "Fixed hard disk media",
      "model": "OEM Genuine 500GB",
      "name": "\\\\.\\PHYSICALDRIVE0",
      "partitionCount": 1,
      "serialNumber": "Notputting that in here",
      "size": 500105249280,
      "smartCapable": True,
      "status": "Degraded",
      "deviceId": "taking this out as well",
      "timestamp": 1573080987.0
    },
        {
      "bytesPerSector": 512,
      "description": "SSD",
      "interfaceType": "RAID",
      "manufacturer": "UNKNOWN",
      "mediaType": "Fixed hard disk media",
      "model": "OEM Genuine 500GB",
      "name": "\\\\.\\PHYSICALDRIVE0",
      "partitionCount": 1,
      "serialNumber": "Notputting that in here",
      "size": 500105249280,
      "smartCapable": True,
      "status": "Pred Fail",
      "deviceId": "taking this out as well",
      "timestamp": 1573080987.0
    }
    ]
}

alerts = ''
checks = ["Pred Fail", "Degraded"]
for i in range (len(napialert['results'])):
    status = json.dumps(napialert['results'][i]['status'])
    if status.strip('"') in checks:
        ninjainterfaceType_str = json.dumps(napialert['results'][i]['interfaceType'], indent=2,)
        ninjamanufacturer_str = json.dumps(napialert['results'][i]['manufacturer'], indent=2,)
        ninjamodel = json.dumps(napialert['results'][i]['model'], indent=2,)
        ninjastatus = json.dumps(napialert['results'][i]['status'], indent=2,)
        alerts += (ninjainterfaceType_str + "\n" + ninjamanufacturer_str + "\n" + ninjamodel + "\n" + ninjastatus + "\n _____________________________\n")
    
print("Here are a list of Hard drive with manufacturer problems: " + alerts)

【讨论】：