擅长:python、mysql、java
<p>你可以用另一种方式:</p>
<pre class="lang-py prettyprint-override"><code>def convertline(x):
# do some logic
# do some logic
# do some logic
return somecalculatedvalue
items = [convertline(line) for line in sample2.splitlines() if line is not 'undesirablevalue']
</code></pre>
<p>在我看来,返回<code>None</code>的函数有点奇怪</p>