擅长:python、mysql、java
<p>您可以创建临时字典来保存您的值,然后再转换回列表:</p>
<pre class="lang-py prettyprint-override"><code>lst = [["R21", 120], ["R21", 120], ["R23", 200]]
out = {}
for k, v in lst:
out.setdefault(k, 0)
out[k] += v
out = [[k, v] for k, v in out.items()]
print(out)
</code></pre>
<p>印刷品:</p>
<pre class="lang-py prettyprint-override"><code>[['R21', 240], ['R23', 200]]
</code></pre>