擅长:python、mysql、java
<p>您可以使用<code>collections.Counter</code>:</p>
<pre><code>In [2]: dic={'1234':{'alertStatus': 'open', 'reasonDescription': None},
...: '4321': {'alertStatus': 'closed', 'reasonDescription': 'Public'},
...: '6789': {'alertStatus': 'open', 'reasonDescription': 'None'}}
In [3]: from collections import Counter
In [4]: Counter(v['alertStatus'] for k,v in dic.items())
Out[4]: Counter({'open': 2, 'closed': 1})
</code></pre>
<p><strong>帮助(计数器)</strong>:</p>
<blockquote>
<p>Dict subclass for counting hashable items. Sometimes called a bag or
multiset. Elements are stored as dictionary keys and their counts are
stored as dictionary values.</p>
</blockquote>