如何从 json 检索数据

Question

我从新闻 API 中检索了 JSON 格式的数据集。我想从 JSON 数据中提取新闻描述。

这是我的代码：-

import requests
import json
url = ('http://newsapi.org/v2/top-headlines?'
       'country=us&'
       'apiKey=608bf565c67f4d99994c08d74db82f54')
response = requests.get(url)
di=response.json()
di = json.dumps(di)
for di['articles'] in di:
  print(article['title'])

数据集如下所示：-

{'status': 'ok', 
 'totalResults': 38, 
 'articles': [
              {'source': 
                {'id': 'the-washington-post', 
                 'name': 'The Washington Post'}, 
               'author': 'Derek Hawkins, Marisa Iati', 
               'title': 'Coronavirus updates: Texas, Florida and Arizona officials say early reopenings fueled an explosion of cases - The Washington Post', 
               'description': 'Local officials in states with surging coronavirus cases issued dire warnings Sunday about the spread of infections, saying the virus was rapidly outpacing containment efforts.', 
               'url': 'https://www.washingtonpost.com/nation/2020/07/05/coronavirus-update-us/', 
               'urlToImage': 'https://www.washingtonpost.com/wp-apps/imrs.php?src=https://arc-anglerfish-washpost-prod-washpost.s3.amazonaws.com/public/K3UMAKF6OMI6VF6BNTYRN77CNQ.jpg&w=1440', 
               'publishedAt': '2020-07-05T18:32:44Z', 
               'content': 'Here are some significant developments:\r\n<ul><li>The rolling seven-day average for daily new cases in the United States reached a record high for the 27th day in a row, climbing to 48,606 on Sunday, … [+5333 chars]'}])

请指导我！

Answer 1

您的代码中几乎不需要更正。下面的代码应该可以工作，我已经删除了API答案中的关键确保您在测试前添加一个

import requests
import json
url = ('http://newsapi.org/v2/top-headlines?'
       'country=us&'
       'apiKey=<API KEY>')
di=response.json()
#You don't need to dump json that is already in json format
#di = json.dumps(di)
#your loop is not correctly defined, below is correct way to do it 
for article in di['articles']:
  print(article['title'])

Answer 2

response.json

{'status': 'ok', 
 'totalResults': 38, 
 'articles': [
                  {'source': 
                    {'id': 'the-washington-post', 
                     'name': 'The Washington Post'}, 
                   'author': 'Derek Hawkins, Marisa Iati', 
                   'title': 'Coronavirus updates: Texas, Florida and Arizona officials say early reopenings fueled an explosion of cases - The Washington Post', 
                   'description': 'Local officials in states with surging coronavirus cases issued dire warnings Sunday about the spread of infections, saying the virus was rapidly outpacing containment efforts.', 
                   'url': 'https://www.washingtonpost.com/nation/2020/07/05/coronavirus-update-us/', 
                   'urlToImage': 'https://www.washingtonpost.com/wp-apps/imrs.php?src=https://arc-anglerfish-washpost-prod-washpost.s3.amazonaws.com/public/K3UMAKF6OMI6VF6BNTYRN77CNQ.jpg&w=1440', 
                   'publishedAt': '2020-07-05T18:32:44Z', 
                   'content': 'Here are some significant developments:\r\n<ul><li>The rolling seven-day average for daily new cases in the United States reached a record high for the 27th day in a row, climbing to 48,606 on Sunday, … [+5333 chars]'}]}

代码：

di = response.json()   # Understand that 'di' is of type 'dictionary', key-value pair
for i in di["articles"]:   
   print(i["description"])

"articles"是字典di的keys之一，对应value是type list的keys。 "description" ，您正在寻找的是此 list (value of "articles") 的一部分。进一步的列表包含字典 (key-value pair)。您可以从 key - description

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