擅长:python、mysql、java
<p>列表在Python中是可变的,因此不需要显式的<code>Mutable</code>类引用:</p>
<pre><code>In [3]: from typing import List
In [7]: def foo(spam:List[int]):
...: spam.append(sum(spam))
...: return spam
In [8]: a = [1,2,3]
In [9]: foo(a)
Out[9]: [1, 2, 3, 6]
</code></pre>