擅长:python、mysql、java
<p>使用<code>timedelta</code>:</p>
<pre><code>datetime.datetime.now() - datetime.timedelta(days=1)
</code></pre>
<p><a href="http://docs.python.org/2/library/datetime.html#timedelta-objects">http://docs.python.org/2/library/datetime.html#timedelta-objects</a></p>