python - 从json中提取某些数据

Question

https://www.huobi.com/p/api/contents/

你好，我想从这个 api 中提取所有的标题，看看标题是否有任何变化..我如何用 python 做？

我收到这个错误:

before_set = before['data']['items']['title']
TypeError: list indices must be integers or slices, not str

---

这是我的代码:

import requests
import json

try:
    with open('notice.json', 'r') as current_notice:
        before = json.loads(current_notice.read())
except IOError:
    before = requests.get('https://www.huobi.com/p/api/contents/').json()
    with open('notice.json', 'w') as current_notice:
        current_notice.write(json.dumps(before))
    print("First run....")

after = requests.get('https://www.huobi.com/p/api/contents/').json()

before_set = before['data']['items']['title']
after_set = after['data']['items']['title']

new_set = after_set - before_set

while True:
    try:
        if not new_set:
            print("No change... Exiting.")
        if new_set:
            print("There are changes")
    except Exception as e:
        print(e)
        pass            

Answer 1

before['data']['items'] 中包含的数据是一个列表。您将使用以下方式访问第一个项目的标题:

before['data']['items'][0]['title']

要获取所有标题，您可以使用列表理解:

before_set = [item['title'] for item in before['data']['items']]