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POCan't append a list of dicts with dict from another list of dicts
 

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  1. POCan't append a list of dicts with dict from another list of dicts
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    <p>Been Googling hours again for answer but seems like my situation is unique, or my understanding of Py is...uh, unique.</p> <p>I have a list of dictionaries (let's call it sqlListOfDict) built from MySQLdb.cursors.DictCursor query, Py print yields this:</p> <pre><code>[{'volYtday': 18083292, 'volToday': 49395261, 'time': datetime.timedelta(0, 34800), 'priceChgPct': Decimal('1.2400'), 'volDiffPct': 173.15414140301445, 'priceNom': Decimal('6.5300'), 'date': datetime.date(2013, 4, 30), 'secCode': 'xoxoxo', 'volDiff': 31311969}] </code></pre> <p>Then I have another list of dictionaries (let's call it myListOfDict), declared empty, Py print yields this:</p> <pre><code>[{'priceChgPct': '', 'volYtday': '', 'priceNom': '', 'volDiffPct': '', 'volToday': '', 'time': '', 'date': '', 'secCode': '', 'volDiff': ''}] </code></pre> <p>I need to append myListOfDict with a specific dictionary from sqlListOfDict by index number, the code:</p> <pre><code>myListOfDict.append(sqlListOfDict[0]) </code></pre> <p>No joy, myListOfDict is still as declared (empty) and Py doesn't give any traceback.</p> <p>I did some experiments:</p> <pre><code>listDictA = [dict.fromkeys(['secCode', 'volDiff'])] listDictB = [{'secCode': 'valB1', 'volDiff': 1000}, {'secCode': 'valB2', 'volDiff': 1000}, {'secCode': 'valB3', 'volDiff': 1000}, {'secCode': 'valB4', 'volDiff': 1000}, {'secCode': 'valB5', 'volDiff': 1000}, {'secCode': 'valA1', 'volDiff': 1000}] </code></pre> <p>Ran the same command:</p> <pre><code>listDictA.append(listDictB[0]) </code></pre> <p>It worked! What did I do wrong for the first case? Thanks for helping.</p>
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    1. USOm Nom
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    1. COCan you share the actual code you have?
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      1. POCan't append a list of dicts with dict from another list of dicts
      1. USMartijn Pieters
    2. CONow that I think a little more about it. You could print out a row without calling .fetchone()...
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      1. POCan't append a list of dicts with dict from another list of dicts
      1. USJason Sperske
    3. COHi Martin, which actual code do you mean? Thanks.
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