How to check if all items in the list are None?
<pre><code>In [27]: map( lambda f,p: f.match(p), list(patterns.itervalues()), vatids )
Out[27]: [None, &lt;_sre.SRE_Match object at 0xb73bfdb0&gt;, None]
</code></pre>

<p>The list can be all <code>None</code> or one of it is an re.Match instance.
What one liner check can I do on the returned list to tell me that the contents are all <code>None</code>?</p>
