擅长:python、mysql、java
<p>这是定义词典的字面方法。在这种情况下,它是一本空字典。与<code>self.submissions = dict()</code>相同</p>
<pre><code>>>> i = {}
>>> z = {'key': 42}
>>> q = dict()
>>> i == q
True
>>> d = dict()
>>> d['key'] = 42
>>> d == z
True
</code></pre>