擅长:python、mysql、java
<p>改变</p>
<pre><code>import datetime
</code></pre>
<p>到</p>
<pre><code>from datetime import datetime
</code></pre>
<p>将使您的第一个代码片段正常工作</p>
<pre><code>from datetime import datetime
now = datetime.now()
reftime1 = datetime(now.year,now.month,now.day,now.hour)
</code></pre>