擅长:python、mysql、java
<p><code>copy</code>模块上的文档这样说:</p>
<blockquote>
<p>In order for a class to define its own copy implementation, it can define special methods <code>__copy__()</code> and <code>__deepcopy__()</code>.
[...]
The latter is called to implement the deep copy operation; it is passed one argument, the memo dictionary.
[...]</p>
</blockquote>
<p>因此,如果您声明这些返回<code>self</code>,那么应该可以实现这个目的。在</p>