擅长:python、mysql、java
<p>您可以使泛型<code>Card</code>类继承它。你知道吗</p>
<pre><code>Card:
constructor:
- number
- owner
- co_owner
methods:
- credit
- charge
- Debit Card (Card)
methods:
- available
- Credit Card (Card)
constructor:
- balance
methods:
- available
- verify_cc
</code></pre>
<p>您可以使用列表将卡片与用户关联。你知道吗</p>
<pre><code>User:
constructor:
- name
- address
- cards (list)
methods:
- add_card
- remove_card
</code></pre>
<p>同样的方法也可以用卡片来追踪交易。你知道吗</p>