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    <pre><code>myJson = [ { "name":"Folder 2", "id":"zRDg", "parent":"OY00", "type":"folder" }, { "name":"Folder 1", "id":"OY00", "type":"folder" }, { "name":"Folder 3", "id":"ZDE1", "type":"folder" }, { "name":"DX00025.jpg", "id":"9Xdd", "parent":"OY00", "type":"jpeg" } ] #this creates a dictionary that maps id names to JSON items. #ex. itemsKeyedById["9Xdd"] gives the jpg item with id "9Xdd" itemsKeyedById = {i["id"]: i for i in myJson} #iterate through each item in the `myJson` list. for item in myJson: #does the item have a parent? if "parent" in item: #get the parent item parent = itemsKeyedById[item["parent"]] #if the parent item doesn't have a "children" member, #we must create one. if "children" not in parent: parent["children"] = [] #add the item to its parent's "children" list. parent["children"].append(item) #filter out any item that has a parent. #They don't need to appear at the top level, #since they will appear underneath another item elsewhere. topLevelItems = [item for item in myJson if "parent" not in item] print topLevelItems </code></pre> <p>Output (with indentation added by me):</p> <pre><code>[ { 'name': 'Folder 1', 'id': 'OY00', 'type': 'folder', 'children': [ { 'name': 'Folder 2', 'id': 'zRDg', 'parent': 'OY00', 'type': 'folder' }, { 'name': 'DX00025.jpg', 'id': '9Xdd', 'parent': 'OY00', 'type': 'jpeg' } ] }, { 'name': 'Folder 3', 'id': 'ZDE1', 'type': 'folder' } ] </code></pre> <p>It also works with items that are nested more than one deep. Example input:</p> <pre><code>myJson = [ { "name":"TopLevel folder", "id":"0", "type":"folder", }, { "name":"MidLevel folder", "id":"1", "type":"folder", "parent":"0" }, { "name":"Bottom Level folder", "id":"2", "type":"folder", "parent":"1" }, { "name":"Vacation Picture", "id":"3", "type":"jpg", "parent":"2" }, ] </code></pre> <p>Output:</p> <pre><code>[ { 'type': 'folder', 'name': 'TopLevel folder', 'id': '0', 'children': [ { 'type': 'folder', 'name': 'MidLevel folder', 'parent': '0', 'id': '1', 'children': [ { 'type': 'folder', 'name': 'Bottom Level folder', 'parent': '1', 'id': '2', 'children': [ { 'type': 'jpg', 'name': 'Vacation Picture', 'parent': '2', 'id': '3' } ] } ] } ] } ] </code></pre>
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    1. COBut will this work for folder withing folder withing folder?
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    2. COYes, you can nest folders as deep as you like.
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    3. COWell i can confirm it works, well but now i can't understand it, if you can explain the lines of code in detail you will get the ***150*** :) Btw new to python, go easy, thanks in advance.
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