python - 将嵌套 json 读取到数据框中

Question

我有一个从 Firebase 导出的 json 文件，如下所示。

{
  "reports" : {
    "Google-Pixel 2 XL" : {
      "-MIoCtD9YUF2G9Esfrfz" : {
        "message" : "04 Oct 2020 23:25:17:047 onCreate MainActivity",
        "timestamp" : 1601825117067
      },
      "-MIoCtFVOxu8wdEHtm6q" : {
        "message" : "04 Oct 2020 23:25:17:214 onCreate Service",
        "timestamp" : 1601825117216
      },
      "-MIoCyBtKMQqQzUHEXsW" : {
        "message" : "04 Oct 2020 23:25:37:682 onStartCommand Service",
        "timestamp" : 1601825137685
      },
      "-MIoFWll9r3qwzWNoGMn" : {
        "message" : "04 Oct 2020 23:36:47:687: (1.3212517, 103.860314)",
        "timestamp" : 1601825807693
      }
    },
    "Vivo 1820" : {
      "-MIoF14JUm6JMZrOzDlL" : {
        "message" : "04 Oct 2020 23:34:37:623 onCreate MainActivity",
        "timestamp" : 1601825677653
      },
      "-MIoF1A9ZZNqTu5W-rQD" : {
        "message" : "04 Oct 2020 23:34:38:016 onCreate Service",
        "timestamp" : 1601825678026
      },
      "-MIoF2gNDua9FfLBTg6q" : {
        "message" : "04 Oct 2020 23:34:44:235 onCreate MainActivity",
        "timestamp" : 1601825684248
      }
    }
  }
}

我正在尝试将其转换为如下所示的 4 列数据框

model             | id                   | message                               | timestamp
Google-Pixel 2 XL | -MIoCtD9YUF2G9Esfrfz | 04 Oct 2020 23:25:17:047 onCreate...  | 1601825117067
Vivo 1820         | -MIoF14JUm6JMZrOzDlL | 04 Oct 2020 23:34:37:623 onCreate...  | 1601825677653

我该怎么做？我尝试了各种方法和标准化，但似乎无法得到它。

data = pd.read_json("firebase-file.json")
df = pd.json_normalize(data, record_path="reports")

谢谢。

Answer 1

我认为你需要自己压平它，好在它并不复杂:

s = [[k, i, *j.values()] for k,v in data["reports"].items() for i, j in v.items()]

print (pd.DataFrame(s))

                   0                     1                                                  2              3
0  Google-Pixel 2 XL  -MIoCtD9YUF2G9Esfrfz     04 Oct 2020 23:25:17:047 onCreate MainActivity  1601825117067
1  Google-Pixel 2 XL  -MIoCtFVOxu8wdEHtm6q          04 Oct 2020 23:25:17:214 onCreate Service  1601825117216
2  Google-Pixel 2 XL  -MIoCyBtKMQqQzUHEXsW    04 Oct 2020 23:25:37:682 onStartCommand Service  1601825137685
3  Google-Pixel 2 XL  -MIoFWll9r3qwzWNoGMn  04 Oct 2020 23:36:47:687: (1.3212517, 103.860314)  1601825807693
4          Vivo 1820  -MIoF14JUm6JMZrOzDlL     04 Oct 2020 23:34:37:623 onCreate MainActivity  1601825677653
5          Vivo 1820  -MIoF1A9ZZNqTu5W-rQD          04 Oct 2020 23:34:38:016 onCreate Service  1601825678026
6          Vivo 1820  -MIoF2gNDua9FfLBTg6q     04 Oct 2020 23:34:44:235 onCreate MainActivity  1601825684248