擅长:python、mysql、java
<p>您可以使用<code>collection.Counter</code>:</p>
<pre><code>>>> alist = ["Book", "Coin", "Book", "Book", "Computer", "Bag"]
>>> inventory = {"Book":3, "Bag":2}
>>> dict(collections.Counter(inventory) + collections.Counter(alist))
{'Bag': 3, 'Book': 6, 'Coin': 1, 'Computer': 1}
</code></pre>