擅长:python、mysql、java
<p><a href="https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.apply.html" rel="nofollow noreferrer">^{<cd1>}</a>一个函数,用于将序列<a href="https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.Series.eq.html" rel="nofollow noreferrer">^{<cd2>}</a><code>?</code>和<code>True</code>结果相加的每个列</p>
<pre><code>data.apply(lambda serie: serie.eq('?').sum(), axis=0)
</code></pre>
<p>如果由于某种原因,内容不完全等于<code>?</code>(例如,它包含额外的空格),请使用<a href="https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.Series.str.contains.html" rel="nofollow noreferrer">^{<cd6>}</a>方法:</p>
<pre><code>data.apply(lambda serie: serie.str.contains('\?').sum(), axis=0)
</code></pre>