擅长:python、mysql、java
<p>列表理解:</p>
<pre><code>l = [{'a':'a' ,'b':'b','c':'lala'},{'a':'a1','b':'b1','c':'lala1'}]
res = ['-'.join(v for k,v in d.items() if k in ('a','b')) for d in l]
print(res)
</code></pre>
<p>输出:</p>
<pre><code>['a-b', 'a1-b1']
</code></pre>