擅长:python、mysql、java
<p>我想在<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.rolling.html" rel="nofollow noreferrer">^{<cd2>}</a>中需要参数<code>min_periods=1</code>:</p>
<blockquote>
<p>min_periods : int, default None</p>
<p>Minimum number of observations in window required to have a value (otherwise result is NA). For a window that is specified by an offset, this will default to 1.</p>
</blockquote>
<pre><code>df = df.rolling(5, min_periods=1).mean()
</code></pre>
<p><strong>样本</strong>:</p>
^{pr2}$