Pandas percentage by value in a column : <p>I want to get a percentage of a particular value in a df column. Say I have a df with (col1, col2 , col3, gender)  gender column has values of M or F. I want to get the percentage of M and F values in the df. </p>

<p>I have tried this, which gives me the number M and F instances, but I want these as a percentage of the total number of values in the df.</p>

<pre><code>df.groupby('gender').size()
</code></pre>

<p>Can someone help?</p>
