由於數據長度不等，將嵌套的 JSON 列表展平為 Pandas DataFrame 的問題

Question

我目前正在嘗試使用以下格式的 JSON 文件：

response = {
    "leads": [{
        "id": 208827181,
        "campaignId": 2595,
        "contactId": 2919361,
        "contactAttempts": 1,
        "contactAttemptsInvalid": 0,
        "lastModifiedTime": "2017-03-14T13:37:20Z",
        "nextContactTime": "2017-03-15T14:37:20Z",
        "created": "2017-03-14T13:16:42Z",
        "updated": "2017-03-14T13:37:20Z",
        "lastContactedBy": 1271,
        "status": "automaticRedial",
        "active": True,
        "masterData": [{
                "id": 2054,
                "label": "Firmanavn",
                "value": "Firma_1"
            },
            {
                "id": 2055,
                "label": "Adresse",
                "value": "Gadenavn_1"
            },
            {
                "id": 2056,
                "label": "Postnr.",
                "value": "2000"
            },
            {
                "id": 2057,
                "label": "Bydel",
                "value": "Frederiksberg"
            },
            {
                "id": 2058,
                "label": "Telefonnummer",
                "value": "25252525"
            }
        ]
    }]
}

masterData 采用嵌套列表格式，但長度也不同。 基本上，每一行/條目都可以分配不同的列。 我希望為每個條目保留一個或多個特定的列。 但是，對於我當前的索引，由於嵌套列表的長度不同，我的索引會中斷。 這是我的代碼：

leads = json_normalize(response['leads'])
df = pd.concat([leads.drop('masterData', 1),
            pd.DataFrame(list(pd.DataFrame(list(leads['masterData']))[4]))
                        .drop(['id', 'label'], 1)
                        .rename(columns={"value": "tlf"})], axis=1)

所需的輸出是：

    active   campaignId  contactAttempts    contactAttemptsInvalid  contactId           created               id          lastContactedBy   lastModifiedTime        nextContactTime       resultData    status          updated               tlf
0   True       2595        1                  0                       2919361             2017-03-14T13:16:42Z  208827181   1271.0          2017-03-14T13:37:20Z    2017-03-15T14:37:20Z    []          automaticRedial 2017-03-14T13:37:20Z    37373737
1   True       2595        2                  0                       2919359             2017-03-14T13:16:42Z  208827179   1271.0          2017-03-14T13:33:30Z    2017-03-15T14:33:30Z    []          privateRedial   2017-03-14T13:33:30Z    55555555
2   True       2595        1                  0                       2919360             2017-03-14T13:16:42Z  208827180   1271.0          2017-03-14T13:36:06Z    None                    []          success         2017-03-14T13:36:06Z    22222222
3   True       2595        1                  0                       2919362             2017-03-14T13:16:42Z  208827182   1271.0          2017-03-14T13:56:39Z    None                    []          success         2017-03-14T13:56:39Z    34343434

其中“tlf”是“masterData”中添加的列。

Answer 1

僅使用json_normalize並在列表中指定列名稱：

L = ['active', 'campaignId', 'contactAttempts', 'contactAttemptsInvalid', 
     'contactId', 'created', 'id', 'lastContactedBy', 'lastModifiedTime', 
     'nextContactTime', 'status', 'updated']
df = json_normalize(response['leads'], 'masterData', L, record_prefix='masterData.')

print (df)
   masterData.id masterData.label masterData.value  active  campaignId  \
0           2054        Firmanavn          Firma_1    True        2595   
1           2055          Adresse       Gadenavn_1    True        2595   
2           2056          Postnr.             2000    True        2595   
3           2057            Bydel    Frederiksberg    True        2595   
4           2058    Telefonnummer         25252525    True        2595   

   contactAttempts  contactAttemptsInvalid  contactId               created  \
0                1                       0    2919361  2017-03-14T13:16:42Z   
1                1                       0    2919361  2017-03-14T13:16:42Z   
2                1                       0    2919361  2017-03-14T13:16:42Z   
3                1                       0    2919361  2017-03-14T13:16:42Z   
4                1                       0    2919361  2017-03-14T13:16:42Z   

          id  lastContactedBy      lastModifiedTime       nextContactTime  \
0  208827181             1271  2017-03-14T13:37:20Z  2017-03-15T14:37:20Z   
1  208827181             1271  2017-03-14T13:37:20Z  2017-03-15T14:37:20Z   
2  208827181             1271  2017-03-14T13:37:20Z  2017-03-15T14:37:20Z   
3  208827181             1271  2017-03-14T13:37:20Z  2017-03-15T14:37:20Z   
4  208827181             1271  2017-03-14T13:37:20Z  2017-03-15T14:37:20Z   

            status               updated  
0  automaticRedial  2017-03-14T13:37:20Z  
1  automaticRedial  2017-03-14T13:37:20Z  
2  automaticRedial  2017-03-14T13:37:20Z  
3  automaticRedial  2017-03-14T13:37:20Z  
4  automaticRedial  2017-03-14T13:37:20Z