擅长:python、mysql、java
<p>可以在字典构造函数中使用关键字参数进行更新</p>
<pre><code>new = dict(old, a=1, b=2, c=3)
# You can also unpack your modifications
new = dict(old, **mods)
</code></pre>
<p>这相当于:</p>
<pre><code>new = old.copy()
new.update({"a": 1, "b": 2, "c": 3})
</code></pre>
<p><a href="https://www.ibisc.univ-evry.fr/~fpommereau/blog/2009-05-12-copy-a-python-dict-with-updates.html" rel="noreferrer">Source</a></p>
<p>注意:<code>dict.copy()</code>创建一个浅拷贝。</p>