擅长:python、mysql、java
<p>“漫长”的道路:</p>
<pre><code>>>> from collections import defaultdict
>>> d = defaultdict(int)
>>> r = defaultdict(list)
>>> for i in l:
... d[i[1]] += i[2]
... r[i[0]].append(d)
...
>>> results = []
>>> for i,v in r.iteritems():
... for k in v[0]:
... results.append((i,k,v[0][k]))
...
>>> results
[('2013-01-04', u'crid9904536154', 1104937),
('2013-01-04', u'crid2557171372', 78874),
('2013-01-04', u'crid7990924609', 976410)]
</code></pre>