擅长:python、mysql、java
<p>或一个班轮:</p>
<pre><code>print([sum([1 for x in i.get('test',[]) if x['testing']=='find']) for i in a if sum([1 for x in i.get('test',[]) if x['testing']=='find'])!=0])
</code></pre>
<p>输出:</p>
<pre><code>[1, 3]
</code></pre>
<p>或两行(可读性更强):</p>
<pre><code>l=[sum([1 for x in i.get('test',[]) if x['testing']=='find']) for i in a]
print(list(filter(None,l)))
</code></pre>
<p>输出:</p>
<pre><code>[1, 3]
</code></pre>