python 嵌套 json 数组

Question

我正在访问 API，示例位于此处 ( https://developer.pagerduty.com/documentation/rest/escalation_policies/on_call )

SUBDOMAIN='XXX'
API_ACCESS_KEY='XXX'

headers = {
    'Authorization': 'Token token={0}'.format(API_ACCESS_KEY),
    'Content-type': 'application/json',
}
url = 'https://{0}.pagerduty.com/api/v1/escalation_policies/on_call'.format(SUBDOMAIN)
r = requests.get(url,headers=headers)
objData = r.json()


for objPolicy in objData['escalation_policies']:
    print objPolicy['name']
    for objOnCall in objPolicy['on_call']:
        print objOnCall['level']
        print objOnCall['start']
        print objOnCall['end']
        for objUser in objOnCall['user']:
            print objUser['name']

我目前收到错误

    print objUser['name']
TypeError: string indices must be integers

如果我的理解是对的，[]是一个列表，{}是一个对象？所以我试图以列表的形式访问一个对象，这就是为什么它不起作用？

嵌套的数量对于新手来说很难理解。有人可以解释并告诉我如何访问 on_call 政策中的每个用户吗？

谢谢

Answer 1

根据API documentation ，user 下有一个对象(认为是“字典”):

...
"user": {
    "id": "P9TX7YH",
    "name": "Cordell Simonis",
    "email": "email_1@acme.pagerduty.dev",
    "time_zone": "Pacific Time (US & Canada)",
    "color": "dark-goldenrod"
}

为了反射(reflect)这一点，请将代码修改为:

user = objOnCall['user']  # user is a dictionary
print(user['name'])  # getting a value from a dictionary by a key