擅长:python、mysql、java
<p>看起来这里不需要熊猫,普通的老Python可以在下面编写<code>counts</code>这样的助手-</p>
<pre><code>from collections import defaultdict
def counts(xs):
counts = defaultdict(int)
for x in xs:
counts[x] += 1
return counts.items()
</code></pre>
<p>然后你可以像这样使用它-</p>
<pre><code>models = ['a', 'b', 'c', 'c', 'c', 'b']
for item, count in counts(models):
print(item, '-', count)
</code></pre>
<p>输出将为-</p>
<pre><code>a - 1
b - 2
c - 3
</code></pre>