title: How to visualise data with groupby
body: <p>I know how to visualise based on age/gender, but I also want to visualise them based on <code>offer_successful</code> column, this column contains <code>0</code> and <code>1</code>, I want to have a look at how many females in <code>0</code> and <code>1</code> etc, can someone provide an example or some links that I can have a look? Many thanks.</p>