擅长:python、mysql、java
<p>你所做的似乎有点让人困惑,但过滤掉任何虚假的东西并不重要:</p>
<pre><code>>>> rowb = [1,2,0,3]
# using list comprehension
>>> len([x for x in rowb if x])
3
# alternatively using filter in Python 2
>>> len(filter(None, rowb))
3
</code></pre>