像 JavaScript 一样在 Python 中访问嵌套对象和数组

// const objectScan = require('object-scan');

const data = { code: 42, items: [{ id: 1, name: 'foo' }, { id: 2, name: 'bar' }] };

const get = (haystack, needle) => objectScan([needle], {
  abort: true,
  rtn: 'value'
})(haystack);

const set = (haystack, needle, value) => objectScan([needle], {
  abort: true,
  rtn: 'bool',
  filterFn: ({ parent, property }) => {
    parent[property] = value;
    return true;
  }
})(haystack);

console.log(get(data, 'items[1].name'));
// => bar

console.log(set(data, 'items[1].name', 'foo2'));
// => true
console.log(data);
// => { code: 42, items: [ { id: 1, name: 'foo' }, { id: 2, name: 'foo2' } ] }

.as-console-wrapper {max-height: 100% !important; top: 0}

<script src="https://bundle.run/[email protected]"></script>

// const objectScan = require('object-scan');

const data = { code: 42, items: [{ id: 1, name: 'foo' }, { id: 2, name: 'bar' }] };

const get = (haystack, ...needles) => objectScan(needles, {
  joined: true,
  rtn: 'entry'
})(haystack);

const set = (haystack, actions) => objectScan(Object.keys(actions), {
  rtn: 'count',
  filterFn: ({ matchedBy, parent, property }) => {
    matchedBy.forEach((m) => {
      parent[property] = actions[m];
    })
    return true;
  }
})(haystack);

console.log(get(data, 'items[0].name', 'items[1].name'));
// => [ [ 'items[1].name', 'bar' ], [ 'items[0].name', 'foo' ] ]

console.log(set(data, {
  'items[0].name': 'foo1',
  'items[1].name': 'foo2'
}));
// => 2
console.log(data);
// => { code: 42, items: [ { id: 1, name: 'foo1' }, { id: 2, name: 'foo2' } ] }

.as-console-wrapper {max-height: 100% !important; top: 0}

<script src="https://bundle.run/[email protected]"></script>

// const objectScan = require('object-scan');

const myData = { code: 42, items: [{ id: 1, name: 'aaa', items: [{ id: 3, name: 'ccc' }, { id: 4, name: 'ddd' }] }, { id: 2, name: 'bbb', items: [{ id: 5, name: 'eee' }, { id: 6, name: 'fff' }] }] };

const findItemById = (haystack, id) => objectScan(['**(^items$).id'], {
  abort: true,
  useArraySelector: false,
  rtn: 'parent',
  filterFn: ({ value }) => value === id
})(haystack);

console.log(findItemById(myData, 5));
// => { id: 5, name: 'eee' }

.as-console-wrapper {max-height: 100% !important; top: 0}

<script src="https://bundle.run/[email protected]"></script>

/* code minified to make the tool easier to run without having to scroll */                                                         let bracketsOnly=!1,lastHighlighted={style:{}};const keyToStr=t=>!bracketsOnly&&/^[a-zA-Z_$][a-zA-Z$_\d]*$/.test(t)?`.${toHTML(t)}`:`[&quot;${toHTML(t)}&quot;]`,pathToData=t=>`data-path="data${t.join("")}"`,htmlSpecialChars={"&":"&amp;","<":"&lt;",">":"&gt;",'"':"&quot;","'":"&#039;","\t":"\\t","\r":"\\r","\n":"\\n"," ":"&nbsp;"},toHTML=t=>(""+t).replace(/[&<>"'\t\r\n ]/g,t=>htmlSpecialChars[t]),makeArray=(t,e)=>`\n  [<ul ${pathToData(e)}>\n    ${t.map((t,a)=>{e.push(`[${a}]`);const n=`<li ${pathToData(e)}>\n        ${pathify(t,e).trim()},\n      </li>`;return e.pop(),n}).join("")}\n  </ul>]\n`,makeObj=(t,e)=>`\n  {<ul ${pathToData(e)}>\n    ${Object.entries(t).map(([t,a])=>{e.push(keyToStr(t));const n=`<li ${pathToData(e)}>\n        "${toHTML(t)}": ${pathify(a,e).trim()},\n      </li>`;return e.pop(),n}).join("")}\n  </ul>}\n`,pathify=(t,e=[])=>Array.isArray(t)?makeArray(t,e):"object"==typeof t&&t!=null?makeObj(t,e):toHTML("string"==typeof t?`"${t}"`:t),defaultJSON='{\n  "corge": "test JSON... \\n   asdf\\t asdf",\n  "foo-bar": [\n    {"id": 42},\n    [42, {"foo": {"baz": {"ba  r<>!\\t": true, "4quux": "garply"}}}]\n  ]\n}',$=document.querySelector.bind(document),$$=document.querySelectorAll.bind(document),resultEl=$("#result"),pathEl=$("#path"),tryToJSON=t=>{try{resultEl.innerHTML=pathify(JSON.parse(t)),$("#error").innerText=""}catch(t){resultEl.innerHTML="",$("#error").innerText=t}},copyToClipboard=t=>{const e=document.createElement("textarea");e.textContent=t,document.body.appendChild(e),e.select(),document.execCommand("copy"),document.body.removeChild(e)},flashAlert=(t,e=2e3)=>{const a=document.createElement("div");a.textContent=t,a.classList.add("alert"),document.body.appendChild(a),setTimeout(()=>a.remove(),e)},handleClick=t=>{t.stopPropagation(),copyToClipboard(t.target.dataset.path),flashAlert("copied!"),$("#path-out").textContent=t.target.dataset.path},handleMouseOut=t=>{lastHighlighted.style.background="transparent",pathEl.style.display="none"},handleMouseOver=t=>{pathEl.textContent=t.target.dataset.path,pathEl.style.left=`${t.pageX+30}px`,pathEl.style.top=`${t.pageY}px`,pathEl.style.display="block",lastHighlighted.style.background="transparent",(lastHighlighted=t.target.closest("li")).style.background="#0ff"},handleNewJSON=t=>{tryToJSON(t.target.value),[...$$("#result *")].forEach(t=>{t.addEventListener("click",handleClick),t.addEventListener("mouseout",handleMouseOut),t.addEventListener("mouseover",handleMouseOver)})};$("textarea").addEventListener("change",handleNewJSON),$("textarea").addEventListener("keyup",handleNewJSON),$("textarea").value=defaultJSON,$("#brackets").addEventListener("change",t=>{bracketsOnly=!bracketsOnly,handleNewJSON({target:{value:$("textarea").value}})}),handleNewJSON({target:{value:defaultJSON}});

/**/                                                                                       *{box-sizing:border-box;font-family:monospace;margin:0;padding:0}html{height:100%}#path-out{background-color:#0f0;padding:.3em}body{margin:0;height:100%;position:relative;background:#f8f8f8}textarea{width:100%;height:110px;resize:vertical}#opts{background:#e8e8e8;padding:.3em}#opts label{padding:.3em}#path{background:#000;transition:all 50ms;color:#fff;padding:.2em;position:absolute;display:none}#error{margin:.5em;color:red}#result ul{list-style:none}#result li{cursor:pointer;border-left:1em solid transparent}#result li:hover{border-color:#ff0}.alert{background:#f0f;padding:.2em;position:fixed;bottom:10px;right:10px}

<!-- -->                                                                                                    <div class="wrapper"><textarea></textarea><div id="opts"><label>brackets only: <input id="brackets"type="checkbox"></label></div><div id="path-out">click a node to copy path to clipboard</div><div id="path"></div><div id="result"></div><div id="error"></div></div>

var data = {
    code: 42,
    items: [{
        id: 1,
        name: 'foo'
    }, {
        id: 2,
        name: 'bar'
    }]
};

// if you want 'bar'
console.log(data.items[1].name);

// if you want array of item names
console.log(data.items.map(x => x.name));

// get the id of the item where name = 'bar'
console.log(data.items.filter(x => (x.name == "bar") ? x.id : null)[0].id);

var data = {
    code: 42,
    items: [{
        id: 1,
        name: 'foo'
    }, {
        id: 2,
        name: 'bar'
    }]
};

$.grep(data.items, function(item) {
    if (item.id === 2) {
        console.log(item.id); //console id of item
        console.log(item.name); //console name of item
        console.log(item); //console item object
        return item; //returns item object
    }

});
// Object {id: 2, name: "bar"}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

var data = {
  code: 42,
  items: [{
    id: 1,
    name: 'aaa',
    items: [{
        id: 3,
        name: 'ccc'
      }, {
        id: 4,
        name: 'ddd'
      }]
    }, {
    id: 2,
    name: 'bbb',
    items: [{
        id: 5,
        name: 'eee'
      }, {
        id: 6,
        name: 'fff'
      }]
    }]
};

var jsonloop = new JSONLoop(data, 'id', 'items');

jsonloop.findNodeById(data, 5, function(err, node) {
  if (err) {
    document.write(err);
  } else {
    document.write(JSON.stringify(node, null, 2));
  }
});

<script src="https://rawgit.com/dabeng/JSON-Loop/master/JSONLoop.js"></script>