title: Matplotlib: How to plot an empty circle in an scatter plot using pandas plot api?
body: <p>I'm trying to plot a scatter plot with pandas api where each point is an empty circle, just with border color and transparency. I've tried a lot of tweaks in this code:</p>
  
  <pre><code> ax = ddf.plot.scatter(
          x='espvida', 
          y='e_anosestudo', 
          c=ddf['cor'],
          alpha=.2,
          marker='o');
  </code></pre>
  
  <p>The generated plot looks like this:</p>
  
  <p><a href="https://i.stack.imgur.com/irkQT.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/irkQT.png" alt="Scatter plot"></a></p>
  
  <p>If you look closely at the points:</p>
  
  <p><a href="https://i.stack.imgur.com/pnHkD.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pnHkD.png" alt="filled points"></a></p>
  
  <p>you'll see that they have a transparent fill color and a border. I'd like it to have just a transparent border. Hou would I do it?</p>