擅长:python、mysql、java
<p>在Python 2.7中,必须这样编写:</p>
<pre><code>super(OperationWithMul, self).Sub(n1,n2)
</code></pre>
<p>详情请参阅<a href="https://docs.python.org/2/library/functions.html#super" rel="nofollow noreferrer">^{<cd1>}'s Python 2.7 documentation</a>。你知道吗</p>