<p>我想确保<code>datetime.datetime.now()</code>返回一个用于测试的特定日期时间,我该怎么做?我试过用pytest的monkeypatch</p>
<pre><code>monkeypatch.setattr(datetime.datetime,"now", nowfunc)
</code></pre>
<p>但这给了我一个错误<code>TypeError: can't set attributes of built-in/extension type 'datetime.datetime'</code></p>