擅长:python、mysql、java
<p>在<strong>view_all</strong>方法中,必须遍历字典:</p>
<pre><code>for key, item in months.iteritems():
print(item.get_month())
</code></pre>
<p>在Month类的<strong>\u str\u</strong>方法中还有其他错误:</p>
<pre><code>"\nPNM: " + self.__PNM + \
</code></pre>
<p>正确的做法是:</p>
<pre><code>"\nPNM: " + self.__pnm + \
</code></pre>