title: Add horizontal to seaborn countplot
body: <p>I have several seaborn bar plot as below, and I would like to add horizontal lines above each set of bars. I know the y coordinates, but how can I automatically get the xmin and ymin range without needing to look at them manually?</p>
  
  <pre><code>sns.countplot(x="class", hue="who", kind="bar", data=titanic)
  plt.hlines(y=30, xmin=-0.5, xmax=0.5, color='black', alpha=0.4)
  plt.hlines(y=50, xmin=0.6, xmax=1.5, color='black', alpha=0.4)
  plt.hlines(y=200, xmin=1.5, xmax=2.5, color='black', alpha=0.4)
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/rsVpI.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/rsVpI.png" alt="enter image description here"></a></p>