擅长:python、mysql、java
<p>使用<a href="https://docs.python.org/3/library/collections.html#collections.Counter">Counter</a>:</p>
<pre><code>>>> l = [(151258350, 2464),
(151258350, 56),
(151262958, 56),
(151258350, 56),
(151262958, 112),
(151262958, 112),
(151259627, 56),
(151262958, 112),
(151262958, 56)]
>>> c = Counter()
>>> for k, v in l:
c[k] += v
>>> c
Counter({151258350: 2576, 151262958: 448, 151259627: 56})
</code></pre>