擅长:python、mysql、java
<blockquote>
<p>"I basically take everything- (the number of none)"</p>
</blockquote>
<p>在Python中:</p>
<pre><code>>>> parasite = [[1,0,1,1,0,0],[0,1,0,0,0,0],[0,0,0,0,0,0],None,None,None]
>>> len(parasite) - parasite.count(None)
3
</code></pre>