json - 属性错误 : 'list' object has no attribute 'get' ?

Question

这是脚本

def validate_record_schema(record):
        device = record.get('Payload', {})
        manual_added= device.get('ManualAdded', None)
        location = device.get('Location', None)
        if isinstance(manual_added, dict) and isinstance(location, dict):
            if 'Value' in manual_added and 'Value' in location:
                return False
        return isinstance(manual_added, bool) and isinstance(location, str)

    print([validate_record_schema(r) for r in data])

这是json数据

data = [{
        "Id": "12",
        "Type": "DevicePropertyChangedEvent",
        "Payload": [{
            "DeviceType": "producttype",
            "DeviceId": 2,
            "IsFast": false,
            "Payload": {
                "DeviceInstanceId": 2,
                "IsResetNeeded": false,
                "ProductType": "product",
                "Product": {
                    "Family": "home"
                },
                "Device": {
                    "DeviceFirmwareUpdate": {
                        "DeviceUpdateStatus": null,
                        "DeviceUpdateInProgress": null,
                        "DeviceUpdateProgress": null,
                        "LastDeviceUpdateId": null
                    },
                    "ManualAdded": {
                    "value":false
                    },
                    "Name": {
                        "Value": "Jigital60asew",
                        "IsUnique": true
                    },
                    "State": null,
                    "Location": {
                    "value":"bangalore"
                   },
                    "Serial": null,
                    "Version": "2.0.1.100"
                }
            }
        }]
    }]

换行 device = device.get('ManualAdded', None) ，我收到以下错误: AttributeError: 'list' object has no attribute 'get'.
请看看并帮助我解决这个问题

我在哪里做错了...

我该如何解决这个错误？

请帮我解决这个问题

Answer 1

您在遍历时遇到跟踪类型的问题 data .一个技巧是在调试过程中添加打印件以查看发生了什么。例如，顶部的“Payload”对象是一个列表 dict , 没有一个 dict .该列表意味着您可以拥有多个设备描述符，因此我编写了一个示例来检查所有设备描述符，如果在此过程中发现错误，则返回 False。您可能需要根据您的验证规则更新它，但这会让您开始。

def validate_record_schema(record):
    """Validate that the 0 or more Payload dicts in record
    use proper types"""
    err_path = "root"
    try:
        for device in record.get('Payload', []):
            payload = device.get('Payload', None)
            if payload is None:
                # its okay to have device without payload?
                continue
            device = payload["Device"]
            if not isinstance(device["ManualAdded"]["value"], bool):
                return False
            if not isinstance(device["Location"]["value"], str):
                return False
    except KeyError as e:
        print("missing key")
        return False

    return True