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    <pre><code>&gt;&gt;&gt; dict1 = dict(arrayOne) &gt;&gt;&gt; dict2 = dict(arrayTwo) &gt;&gt;&gt; keyset = set(dict1.keys() + dict2.keys()) &gt;&gt;&gt; [[key, dict1.get(key, 0), dict2.get(key, 0)] for key in keyset] [['james', 35, 36], ['robert', 12, 0], ['charles', 0, 45], ['michael', 28, 17], ['trevor', 0, 24], ['jack', 18, 0], ['steven', 23, 4]] </code></pre> <p>This gets a bit more complicated if you want to add multiple columns; a dictionary is then best. But having <code>0</code>s in the right places becomes a challenge, because when we add a name to the "master dictionary", we have to make sure it starts with a list of <code>0</code>s of the right length. I'm tempted to create a new class for this, but first, here's a basic function-based solution:</p> <pre><code>def add_column(masterdict, arr): mdlen = len(masterdict[masterdict.keys()[0]]) newdict = dict(arr) keyset = set(masterdict.keys() + newdict.keys()) for key in keyset: if key not in masterdict: masterdict[key] = [0] * mdlen masterdict[key].append(newdict.get(key, 0)) arrayOne = [["james", 35], ["michael", 28], ["steven", 23], ["jack", 18], ["robert", 12]] arrayTwo = [["charles", 45], ["james", 36], ["trevor", 24], ["michael", 17], ["steven", 4]] arrayThree = [["olliver", 11], ["james", 39], ["john", 22], ["michael", 13], ["steven", 6]] masterdict = dict([(i[0], [i[1]]) for i in arrayOne]) add_column(masterdict, arrayTwo) print masterdict add_column(masterdict, arrayThree) print masterdict </code></pre> <p>Output:</p> <pre><code>{'james': [35, 36], 'robert': [12, 0], 'charles': [0, 45], 'michael': [28, 17], 'trevor': [0, 24], 'jack': [18, 0], 'steven': [23, 4]} {'james': [35, 36, 39], 'robert': [12, 0, 0], 'charles': [0, 45, 0], 'michael': [28, 17, 13], 'trevor': [0, 24, 0], 'olliver': [0, 0, 11], 'jack': [18, 0, 0], 'steven': [23, 4, 6], 'john': [0, 0, 22]} </code></pre>
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    1. COJust to point out, you can do `dict1.get(key, 0)`, etc to provide a default value of `0` instead of `None`, as the OP requested.
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    2. CO@Joe, yeah I was doing that just as you posted your comment.
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    3. COThanks guys, I am not very knowledgeable of pythons dictionary properties, but I was wondering if this would work, if I try to add a third array to the result array
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