擅长:python、mysql、java
<p>你应该看看<a href="https://docs.python.org/3/library/collections.html#collections.Counter" rel="nofollow noreferrer">Counters</a>:</p>
<pre><code>from collections import Counter
inventory = {'rope': 1, 'torch':6, 'gold coin':42, 'dagger': 1, 'arrow': 12}
inventory_ctr = Counter(inventory)
update = ['rope', 'torch']
update_ctr = Counter(update)
new_inventory_ctr = inventory_ctr + update_ctr
print(new_inventory_ctr)
</code></pre>