擅长:python、mysql、java
<p>将惩罚设置为实例属性,就像<code>money</code>是:</p>
<pre><code>def __init__(self, initial_balance):
"""Creates an account with the given balance."""
self.money = initial_balance
self.penalty = 0
</code></pre>
<p>后来:</p>
<pre><code>def withdraw(self, amount):
if self.money - amount < 0:
self.penalty += 5
</code></pre>