Python 3-从嵌套字典的键中提取值

在我努力尝试的过程中，希望在这里提供一些指导。我正在使用python 3.8.5。

我正在查询一个停车场预订系统，该系统返回可用性的json列表。结果有很多嵌套的字典，我正在努力提取我想要的值。

这就是我一直在做的：

import requests
import json

enquiry = requests.post(url.....) #queries api, this works fine

results = enquiry.text #extracts response data

dictionary = json.loads(results) #convert response to python dict

如果有一个插槽可用，我会得到此输出（对长度表示歉意）。如果有多个插槽可用，我将重复获得相同的输出：

{
    "data": {
        "services": [{
            "id": null,
            "name": null,
            "services": [{
                "id": null,
                "name": "Car Park",
                "met": true,
                "filterCount": 1,
                "primary": true,
                "options": [{
                    "id": "9",
                    "images": [],
                    "available": true,
                    "calendarId": "AAAA",
                    "templateId": "BBBB",
                    "capacity": 0,
                    "name": "Car Park Slot 3",
                    "sessionId": "CCCC",
                    "functions": null,
                    "startDate": "2020-08-18T13:30:00Z", <--this is what I want to extract
                    "endDate": "2020-08-18T14:30:00Z",
                    "geo": {
                        "lat": 0.0,
                        "lng": 0.0
                    },
                    "selected": false,
                    "linkedServices": [],
                    "tiers": null
                }]
            }],
            "currentBookingId": null,
            "startDate": {
                "ms": 1597757400000,
                "year": 2020,
                "month": 8,
                "day": 18,
                "dayOfWeek": 2,
                "time": {
                    "seconds": 0,
                    "minutes": 30,
                    "hours": 14,
                    "days": 0
                }
            },
            "endDate": {
                "ms": 1597761000000,
                "year": 2020,
                "month": 8,
                "day": 18,
                "dayOfWeek": 2,
                "time": {
                    "seconds": 0,
                    "minutes": 30,
                    "hours": 15,
                    "days": 0
                }
            },
            "sessionId": "2222222",
            "chargeType": 1,
            "hasPrimaryBookable": false,
            "hasBookable": false,
            "hasDiscounts": false,
            "hasMultipleTiers": false,
            "isPreferred": false,
            "primaryServiceAvailable": true,
            "primaryServiceId": null,
            "primaryServiceType": "undefined",
            "unavailableAttendees": []
        }],
        "bookingLimit": null
    },
    "success": true,
    "suppress": false,
    "version": "2.3.293",
    "message": null,
    "result": null,
    "errors": null,
    "code": null,
    "flags": 0,
    "redirect": null
}

我要提取：

"startDate": "2020-08-18T13:30:00Z"

从每个键中返回的任何插槽中的值对。但是，我无法解决。

提取整个嵌套词典的内容也将包含相同的数据，但是随后将需要进行更多的工作来对其进行整理。

"startDate": {
                "ms": 1597757400000,
                "year": 2020,
                "month": 8,
                "day": 18,
                "dayOfWeek": 2,
                "time": {
                    "seconds": 0,
                    "minutes": 30,
                    "hours": 14,
                    "days": 0
                }

我已经尝试了很多dictionary.get和dictionary.items变体，但似乎什么也做不到。

我尝试了类似的东西

key = ('startDate')
availability = dictionary.get(key)
print(availability)

这只会返回“ none”，所以我想办法

有指针吗？

提前致谢！