擅长:python、mysql、java
<p>我认为这是<code>dict.popitem</code>的一个很好的用例:</p>
<pre><code>old_dict = {1: 2, 3: 4, 5: 6}
new_dict = {7: 8}
def move_item(old, new):
k, v = old.popitem()
new[k] = v
move_item(old_dict, new_dict)
print(old_dict, new_dict)
</code></pre>
<p>有结果的</p>
<pre><code>{1: 2, 3: 4} {7: 8, 5: 6}
</code></pre>