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    <p>Here's a translation of what you wanted to do:</p> <pre><code>for labeldic in [{"label":"Cut"},{"label":"Copy"},{"label":"Paste"},{"label":"Delete"}]: labeldic.update({"state": "disabled"}) editmenu.add_command(**labeldic) </code></pre> <p>There were three problems I fixed. </p> <p>The first is that dictionary keys need to be quoted if they are strings. If you want a dict mapping the string <code>'label'</code> to the the string <code>'cut'</code>, you can do it using the dict literal <code>{'label': 'cut'}</code>, or else possibly with the <code>dict()</code> constructor which expands keyword arguments that way: <code>dict(label='cut')</code>. As you discovered, <code>{label: 'cut'}</code> wouldn't work, because it tries to use a variable's value for the key, but there is no such variable.</p> <p>The second is that you can't merge dictionaries using the + operator. It doesn't work, unfortunately. There is, however, an <a href="http://docs.python.org/library/stdtypes.html#dict.update" rel="nofollow">update method</a> that mutates the dict it's called on. Since it doesn't return a merged dict, it can't be used inline the way you used +.</p> <p>The third problem is that passing a dict is not the same as passing in keyword arguments. <code>foo(bar='baz')</code> is not the same as <code>foo({'bar':'baz'})</code>, but it <em>is</em> the same as <code>foo(**{'bar':'baz'})</code>. The <code>**</code> syntax in function calling <a href="http://docs.python.org/tutorial/controlflow.html#unpacking-argument-lists" rel="nofollow">"unpacks"</a> a dictionary into keyword arguments.</p> <p>Regardless it's sort of weird style. Here's what I would do instead:</p> <pre><code>for label in ['Cut', 'Copy', 'Paste', 'Delete']: editmenu.add_command(label=label, state='disabled') </code></pre>
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    1. USDevin Jeanpierre
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    1. COvery nice, thanks a lot for the thorough explanation :)
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    2. CO+1 on the alternate suggestion. The "labeldic" solution is ugly and hard to read -- completely negating anything gained by "removing the clutter". Except in the most performance-sensitive cases, one should always strive to make code as readable as possible.
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      1. USBryan Oakley
 

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