擅长:python、mysql、java
<p>存在<code>collections</code>模块</p>
<pre><code>import collections
....
count = collections.Counter()
for p in people:
count[p['Nationality']] += 1;
print 'There are', len(count), 'nationalities in this list.'
</code></pre>
<p>这样你也可以数出每个国家。</p>
<pre><code>print(count.most_common(16))#print 16 most frequent nationalities
</code></pre>