Question

我有一个json文件，其中包含900篇文章的元数据，我想从中提取Urls。我的文件就是这样

[
{
    "title": "The histologic phenotypes of …",
    "authors": [
        {
            "name": "JE Armes"
        },
    ],
    "publisher": "Wiley Online Library",
    "article_url": "https://onlinelibrary.wiley.com/doi/abs/10.1002/(SICI)1097-0142(19981201)83:11%3C2335::AID-CNCR13%3E3.0.CO;2-N",
    "cites": 261,
    "use": true
},

{
    "title": "Comparative epidemiology of pemphigus in ...",
    "authors": [
        {
            "name": "S Bastuji-Garin"
        },
        {
            "name": "R Souissi"
        }
        ],
        "year": 1995,
        "publisher": "search.ebscohost.com",
    "article_url": "http://search.ebscohost.com/login.aspx?direct=true&profile=ehost&scope=site&authtype=crawler&jrnl=0022202X&AN=12612836&h=B9CC58JNdE8SYy4M4RyVS%2FrPdlkoZF%2FM5hifWcv%2FwFvGxUCbEaBxwQghRKlK2vLtwY2WrNNl%2B3z%2BiQawA%2BocoA%3D%3D&crl=c",
    "use": true
    },
 .........

我想用objectpath检查文件以创建json.tree以排除URL。这是我要执行的代码

  1.    import json
  2.    import objectpath
  3.    with open("Data_sample.json") as datafile: data = json.load(datafile)
  4.    jsonnn_tree = objectpath.Tree(data['name of data'])
  5.    result_tuple = tuple(jsonnn_tree.execute('$..article_url'))

但是在创建树的第4步中，我必须插入数据标记的名称，我认为我不在文件中。我该如何替换这条线？

Answer 1

您可以使用列表理解功能获取所有文章网址。

import json

with open("Data_sample.json") as fh:
    articles = json.load(fh)

article_urls = [article['article_url'] for article in articles]

Answer 2

您可以像这样实例化树：

componentDidMount() {
const { children } = this.props;
let selectedOption = null;
// check if child elements have a 'selected' attribute and set state based on it
React.Children.map(children, (child, index) => {
  if (child.props.selected) {
    selectedOption = index;
  }
});

this.setState({ selectedOption });

最后：

tobj = op.Tree(your_data)
results = tobj.execute("$.article_url")

将产生：

results = [x for x in results]

Answer 3

您尝试删除引用并仅使用：

jsonnn_tree = objectpath.Tree(data)

使用python从json文件中提取没有数据名称的url

3 个答案: