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    <p>You have a serious indentation problem after the (unnecessary) <code>else: pass</code>. Fix that and try again. Does the problem occur with your sample input data? other data? First time around the loop? What is the value of <code>thisKey</code> that is causing the problem [hint: it's reported in the KeyError error message]? What are the contents of masterDictionary just before the error happens [hint: sprinkle a few <code>print</code> statements around your code]?</p> <p>Other remarks not relevant to your problem:</p> <p>Instead of <code>if thisKey in masterDictionary == False:</code> consider using <code>if thisKey not in masterDictionary:</code> ... comparisons against <code>True</code> or <code>False</code> are almost always redundant and/or a bit of a "code smell".</p> <p>Python convention is to reserve names with an initial capital letter (like <code>Item</code>) for classes.</p> <p>Using only one space per indentation level makes code almost illegible and is severely deprecated. Use 4 always (unless you have a good reason -- but I've never heard of one).</p> <p><strong>Update</strong> I was wrong: <code>thisKey in masterDictionary == False</code> is worse than I thought; because <code>in</code> is a relational operator, chained evaluation is used (like <code>a &lt;= b &lt; c</code>) so you have <code>(thisKey in masterDictionary) and (masterDictionary == False)</code> which will always evaluate to False, and thus the dictionary is never updated. The fix is as I suggested: use <code>if thisKey not in masterDictionary:</code></p> <p>Also it looks like <code>thisList</code> (initialised but not used) should be <code>thisSublist</code> (used but not initialised).</p>
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    1. COThanks again for the help
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    2. CO@Yuri Hyuga: If you believe that your question has been answered, as well as thanks, please "accept" the answer by clicking on the big "tick" outline at the left of the answer.
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    3. COThanks again for your help John. It appears I jumped the gun on thinking I had solved this problem. Any ideas???
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