擅长:python、mysql、java
<p>只需通过键<code>gold</code>访问值,并使用<code>+=</code>将<code>50</code>添加到值中:</p>
<pre><code>>>> inventory = {'gold' : 500, 'pouch' : ['flint', 'twine', 'gemstone']}
>>> inventory['gold'] += 50
>>> inventory
{'pouch': ['flint', 'twine', 'gemstone'], 'gold': 550}
</code></pre>