擅长:python、mysql、java
<p>或者从<code>itertools</code>使用<code>groupby</code>:</p>
<pre><code>from itertools import groupby
def sum_by_type(une_formation, TYPE_String):
return [sum(i[1] for i in group) for key, group in groupby(sorted(une_formation, key = lambda i: i[0]), lambda i: i[0]) if key == TYPE_String ][0]
</code></pre>