如何解析包含多個對象的JSON響應

Question

我正在調用的REST API在單個JSON響應中返回多個對象。 使用Python 2.7，我試圖解析此響應，以便可以為響應中的ALL對象打印其中一些值。

從REST API響應中給定的所有對象中提取數據的最佳方法是什么？

我想要一個列表，其中包含JSON響應中每個對象的“鍵”，“名稱”和“ emailAddress”。

這是我對響應中的單個對象執行的操作：

>>>> a = json.loads(response)
>>> print a.get(key), ";", a.get('name'), ";", a.get('emailAddress')
keyOne ; nameOne ; mailOne

對於多個對象，我希望每個對象都有鍵；名稱；電子郵件顯示在新行上。

響應數據的結構如下：

[
  {
    "self": "https://example1.com",
    "key": "keyOne",
    "name": "nameOne",
    "emailAddress": "mailOne",
    "avatarUrls": {
      "48x48": "https://test.com/secure/useravatar?avatarId=1",
      "24x24": "https://test.com/secure/useravatar?size=small&avatarId=1",
      "16x16": "https://test.com/secure/useravatar?size=xsmall&avatarId=1",
      "32x32": "https://test.com/secure/useravatar?size=medium&avatarId=1"
    },
    "displayName": "displayNameOne",
    "active": true,
    "timeZone": "Europe",
    "locale": "en_UK"
  },
  {
    "self": "https://example2.com",
    "key": "keyTwo",
    "name": "nameTwo",
    "emailAddress": "mailTwo",
    "avatarUrls": {
      "48x48": "https://test.com/secure/useravatar?avatarId=2",
      "24x24": "https://test.com/secure/useravatar?size=small&avatarId=2",
      "16x16": "https://test.com/secure/useravatar?size=xsmall&avatarId=2",
      "32x32": "https://test.com/secure/useravatar?size=medium&avatarId=2"
    },
    "displayName": "displayNameTwo",
    "active": false,
    "timeZone": "Europe",
    "locale": "en_US"
  }
]

Answer 1

響應只是一個對象數組。 您需要遍歷此數組並為一個對象打印要打印的鍵。

resp = ...
for a in resp:
    print a.get(key), ";", a.get('name'), ";", a.get('emailAddress')

Answer 2

遍歷響應列表以獲取所需鍵的值：

j_res = [
          {
            "self": "https://example1.com", 

             # rest of the response here

            "timeZone": "Europe",
            "locale": "en_US"
          }
        ]

for elem in j_res:
    print(elem.get('key', "Key does not exist"), elem.get('name', 'Name does not exist'), elem.get('emailAddress', 'emailAddress does not exist'))

輸出 ：

keyOne nameOne mailOne
keyTwo nameTwo mailTwo

編輯 ：

如果要在元組列表中使用它們：

print([(elem.get('key', None), elem.get('name', None), elem.get('emailAddress', None)) for elem in j_res])

輸出 ：

[('keyOne', 'nameOne', 'mailOne'), ('keyTwo', 'nameTwo', 'mailTwo')]

編輯2 ：

由於響應返回的是布爾值（ true / false ）而不是字符串，因此，一種解決方法是將響應轉換為字符串，然后用字符串替換無效的布爾值，然后迭代列表：

j_res = '''[
  {
    "self": "https://example1.com",
    "key": "keyOne",
    "name": "nameOne",
    "emailAddress": "mailOne",
    "avatarUrls": {
      "48x48": "https://test.com/secure/useravatar?avatarId=1",
      "24x24": "https://test.com/secure/useravatar?size=small&avatarId=1",
      "16x16": "https://test.com/secure/useravatar?size=xsmall&avatarId=1",
      "32x32": "https://test.com/secure/useravatar?size=medium&avatarId=1"
    },
    "displayName": "displayNameOne",
    "active": true,                      # notice this
    "timeZone": "Europe",
    "locale": "en_UK"
  },
  {
    "self": "https://example2.com",
    "key": "keyTwo",
    "name": "nameTwo",
    "emailAddress": "mailTwo",
    "avatarUrls": {
      "48x48": "https://test.com/secure/useravatar?avatarId=2",
      "24x24": "https://test.com/secure/useravatar?size=small&avatarId=2",
      "16x16": "https://test.com/secure/useravatar?size=xsmall&avatarId=2",
      "32x32": "https://test.com/secure/useravatar?size=medium&avatarId=2"
    },
    "displayName": "displayNameTwo",
    "active": false,                   # notice this
    "timeZone": "Europe",
    "locale": "en_US"
  }
]'''


from ast import literal_eval

res = literal_eval(j_res.replace("true","'true'").replace("false", "'false'"))    
print([(elem.get('key', None), elem.get('name', None), elem.get('emailAddress', None)) for elem in res])

輸出 ：

[('keyOne', 'nameOne', 'mailOne'), ('keyTwo', 'nameTwo', 'mailTwo')]