title: multiply all values in a column python pandas
body: <p>I am using pandas 1.14 and python 3.8</p>
  <p>Given a dataframe:</p>
  <pre><code>Id      A      B
  1       3      4
  2       3      4
  3       1      2
  4       4      3
  </code></pre>
  <p>If I want to sum all values in A column I would simply to <code>sum(df[&quot;A&quot;])</code>
  How can I replace sum -&gt; multiplication?</p>
  <p>what I want is <code>multiply(df[&quot;A&quot;])</code> which would return 3 x 3 x 1 x 4 = 36.</p>
  <p>Thanks in advance!</p>