擅长:python、mysql、java
<pre><code>import operator
import itertools
with open('blah') as infile, open('blahout', 'w') as outfile:
writer = csv.writer(outfile, delimiter='\t')
for k,group in itertools.groupby(csv.reader(infile, delimiter='\t'), operator.itemgetter(0,1)):
writer.writerow(list(k) + [sum(float(r[-1]) for r in group)])
</code></pre>