擅长:python、mysql、java
<p>开始</p>
<pre><code>dates = {201101{perf=10, reli=20, qos=300}, 201102{perf=40, reli=0, qos=30}}
</code></pre>
<p>不是有效的python dict。这是:</p>
^{pr2}$
<p>一旦您将dict的dict初始化为:</p>
<pre><code>dates = {201101:{'perf':0, 'reli':0}, 201102:{'perf':0, 'reli':0}}
</code></pre>
<p>您可以通过执行以下操作来更新它:</p>
<pre><code>dates[201101]['perf'] = 10
</code></pre>
<p>演示:</p>
<pre><code>>>> dates = {201101:{'perf':0, 'reli':0}, 201102:{'perf':0, 'reli':0}}
>>> dates[201101]['perf'] = 10
>>> dates
{201101: {'reli': 0, 'perf': 10}, 201102: {'reli': 0, 'perf': 0}}
</code></pre>