擅长:python、mysql、java
<p>使用<a href="http://docs.python.org/library/sets.html" rel="nofollow">python set</a>来保存元素的唯一列表。在添加元素时将删除重复项。</p>
<pre><code>output = set()
for filename in filenames:
data = json.loads(open(filename, 'r').read())
for row in data:
output.add(row.get('su'))
# convert back to a list
output = list(output)
</code></pre>