Python 如何处理反序列化数据结构

如果状态已达到，并且状态已开始，我希望获取时间戳。但我发现我在这里使用的当前方法（maxsplit）存在一个问题。由于下面包含（\n\n）的行，我得到下面提到的错误。有些数据有“\n\n”，有些没有。我们如何处理这个案子？我只需要状态，是否可以过滤掉Cupdate键

"detail": "Info from Railway\nTrain: T12049 \nStatus: Reached\nCupdate: Arrival Info: On Time.\n\nIRCTC"

代码：

response.json

{
"ndatas": [
{   
    "results": {
        "pnr_number": "PNR9087651232",
        "Reservation Date": "2020-09-29T10:33:55.000+0000",
        "Current State": "Waiting List",
        "BookingLogs": [
            {
                "pnr_category": "agent",
                "tstp": "2020-09-29T10:54:56.000+0000",
                "detail": "Booking Closed: Updated customer"
            },
            {
                "pnr_category": "Railway",
                "tstp": "2020-09-29T10:56:41.000+0000",
                "detail": "Tatkal tickets reservation is open"
            },
            {
                "pnr_category": "booking_via_irctc",
                "tstp": "2020-09-29T10:56:54.000+0000",
                "detail": "Info from Railway\nTrain: T12049 \nStatus: Started\nCupdate: Functioning on Time"
            },
            {
                "pnr_category": "booking_via_irctc",
                "tstp": "2020-09-30T14:44:34.000+0000",
                "detail": "Info from Railway\nTrain: T12049 \nStatus: Reached\nCupdate: On Time"
            },
            {
                "pnr_category": "agent",
                "tstp": "2020-10-01T07:12:20.000+0000",
                "detail": "All bookings Truncated"
            },
            {
                "pnr_category": "booking_via_irctc",
                "tstp": "2020-10-07T15:30:16.000+0000",
                "detail": "Info from Railway\nTrain: T12049 \nStatus: Cancelled\nCupdate: Heavy Rain"
            }
        ],
        "from": "Kolkatta",
        "to loc": "Mumbai"
    }   
},
{   
    "results": {
        "pnr_number": "PNR90876512322",
        "Reservation Date": "2020-09-29T10:33:55.000+0000",
        "Current State": "Waiting List",
        "BookingLogs": [
            {
                "pnr_category": "agent",
                "tstp": "2020-09-29T10:54:56.000+0000",
                "detail": "Booking Closed: Updated customer"
            },
            {
                "pnr_category": "Railway",
                "tstp": "2020-09-29T10:56:41.000+0000",
                "detail": "Tatkal tickets reservation is open"
            },
            {
                "pnr_category": "booking_via_irctc",
                "tstp": "2020-09-29T10:56:54.000+0000",
                "detail": "Info from Railway\nTrain: T12049 \nStatus: Started\nCupdate: Functioning on Time"
            },
            {
                "pnr_category": "booking_via_irctc",
                "tstp": "2020-09-30T14:44:34.000+0000",
                "detail": "Info from Railway\nTrain: T12049 \nStatus: Reached\nCupdate: Arrival Info: On Time.\n\nIRCTC"
            },
            {
                "pnr_category": "agent",
                "tstp": "2020-10-01T07:12:20.000+0000",
                "detail": "All bookings Truncated"
            },
            {
                "pnr_category": "booking_via_irctc",
                "tstp": "2020-10-07T15:30:16.000+0000",
                "detail": "Info from Railway\nTrain: T12049 \nStatus: Cancelled\nCupdate: Heavy Rain"
            }
        ],
        "from": "Kolkatta",
        "to loc": "Mumbai"
    }   
}
]
}

错误：

C:\DeveloperArea\PycharmProjects\python-rest-client\venv\Scripts\python.exe C:/DeveloperArea/PycharmProjects/python-rest-client/demo_data.py
Traceback (most recent call last):
  File "C:/DeveloperArea/PycharmProjects/python-rest-client/demo_data.py", line 48, in <module>
    main()
  File "C:/DeveloperArea/PycharmProjects/python-rest-client/demo_data.py", line 31, in main
    results = [
  File "C:/DeveloperArea/PycharmProjects/python-rest-client/demo_data.py", line 34, in <listcomp>
    *extract_started_reached_tstps(record["results"]["BookingLogs"]),
  File "C:/DeveloperArea/PycharmProjects/python-rest-client/demo_data.py", line 14, in extract_started_reached_tstps
    details = dict(line.split(': ', maxsplit=1) for line in log["detail"].splitlines()[1:])
ValueError: dictionary update sequence element #3 has length 1; 2 is required

Process finished with exit code 1

C:\DeveloperArea\PycharmProjects\python rest client\venv\Scripts\python.exe C:/DeveloperArea/PycharmProjects/python rest client/demo_data.py
回溯（最近一次呼叫最后一次）：
文件“C:/DeveloperArea/PycharmProjects/pythonrestclient/demo_data.py”，第48行，在
main（）
文件“C:/DeveloperArea/PycharmProjects/pythonrestclient/demo_data.py”，第31行，在main中
结果=[
文件“C:/DeveloperArea/PycharmProjects/pythonrestclient/demo_data.py”，第34行，在
*提取\u开始\u到达\u tstps（记录[“结果”][“预订日志]），
文件“C:/DeveloperArea/PycharmProjects/python rest client/demo_data.py”，第14行，在extract_start_reacted_tstps中
对于日志[“detail”]中的行，details=dict（line.split（“：”，maxslit=1）。splitlines（）[1:]
ValueError:字典更新序列元素#3的长度为1；需要2
进程已完成，退出代码为1

您的问题实际上与json无关。问题是如何处理反序列化的数据结构，尤其是如何解析此字符串。我认为您可能应该只使用正则表达式，这里有一个模式，仅在单独的换行上拆分，使用负向后看和负向前看：

>>> regex = re.compile("(?<!\n)\n(?!\n)")
>>> regex.split(s)
['Info from Railway', 'Train: T12049 ', 'Status: Reached', 'Cupdate: Arrival Info: On Time.\n\nIRCTC']

---

我如何将正则表达式合并到我的代码中？你能帮我吗？我从来没有使用过正则表达式，这个主题对我来说是很新的。我尝试过类似的方法，但没有效果。任何指针都会有帮助

>>> regex = re.compile("(?<!\n)\n(?!\n)")
>>> regex.split(s)
['Info from Railway', 'Train: T12049 ', 'Status: Reached', 'Cupdate: Arrival Info: On Time.\n\nIRCTC']

>>> regex = re.compile(r"Status: (\S+)")
>>> regex.search(s).group()
'Status: Reached'
>>> regex.search(s).group(1)
'Reached'