title: How to remove gaps between bars in Matplotlib bar chart
body: <p>I'm making a bar chart in Matplotlib with a call like this:</p>
  
  <pre><code>xs.bar(bar_lefts, bar_heights, facecolor='black', edgecolor='black')
  </code></pre>
  
  <p>I get a barchart that looks like this:</p>
  
  <p><img src="https://i.stack.imgur.com/W4DXU.png" alt="Bar chart with gaps"></p>
  
  <p>What I'd like is one with no white gap between consecutive bars, e.g. more like this:</p>
  
  <p><img src="https://i.stack.imgur.com/dCr47.png" alt="enter image description here"></p>
  
  <p>Is there a way to achieve this in Matplotlib using the <code>bar()</code> function?</p>