Doing validation across a large number of items using all()
<p>I have about 100 fields I need to make sure have non-empty values. To do this I am doing:</p>

<pre><code>if all([field1, field2, ...]):
    print 'ok'
else:
    raise
</code></pre>

<p>However, I'd like to know <em>which</em> fields have the empty values, so I can prompt the user to correct those. Is there a straightforward way to show which fields have the empty values in a large-scale validation, using <code>all()</code> or another method?</p>
