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POSorting data hierarchically
 

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    <p>My python program returns a list containing data of sub-list. Each sub-list contains the unique id of an article and the parent id of that article viz </p> <pre><code>pages_id_list ={ {22, 4},{45,1},{1,1}, {4,4},{566,45},{7,7},{783,566}, {66,1},{300,8},{8,4},{101,7},{80,22}, {17,17},{911,66} } </code></pre> <p>In each <em>sub</em>-list, the data is structured this way <code>{*article_id*, *parent_id*}</code> If the article_id and parent_id are the same it obviously mean that article has no parent.</p> <p>I would like to sort the data using minimal code such that for each article, I can readily access a list of it's children and grandchildren (nested data) if available. For example (using the example data above) I should be able to print at the end of the day:</p> <pre><code> 1 -45 --566 ---783 -66 --911 </code></pre> <p>.... for article id 1</p> <p>I could only sort out the highest level (Ist and 2nd generation) ids. Having problem getting the 3rd and subsequent generations.</p> <p>This is the code I used:</p> <pre><code>highest_level = set() first_level = set() sub_level = set() for i in pages_id_list: id,pid = i['id'],i['pid'] if id == pid: #Pages of the highest hierarchy highest_level.add(id) for i in pages_id_list: id,pid = i['id'],i['pid'] if id != pid : if pid in highest_level: #First child pages first_level.add(id) else: sub_level.add(id) </code></pre> <p>My code sadly does not work.</p> <p>Any help/nudge in the right direction will be appreciated. Thanks</p> <p>David</p>
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