title: python seaborn plotting using index when index has some missing values
body: <p>I have a dataframe as below. Index is blank for some rows. I want to plot it and my code is as below</p>
  <ol>
  <li>i am struggling with <code>marker</code> It is appearing only for few points - how could i show all the points?</li>
  <li>How could I rotate x axis labels. I tried the last line that i have commented.</li>
  </ol>
  <p><code>lst = [5,10,8,7,8,4,6,8,9]</code></p>
  <p><code>df = pd.DataFrame(lst, index =['a', '', '', 'd', '', '', '','e','f'], columns =['Names'])</code></p>
  <p><code>df</code></p>
  <p><a href="https://i.stack.imgur.com/dsHrT.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dsHrT.png" alt="enter image description here" /></a></p>
  <pre><code>#how to show poings with missing index and how to rotate x axis labels by 90 degree?
  
  import seaborn as sns
  #sns.set(rc = {'figure.figsize':(20,10)})
  plt.figure(figsize = (20,10))
  plot=sns.lineplot(data=df['Names'],marker='o')
  #plot.set_xticklabels(plot.get_xticklabels(),rotation = 30)
  </code></pre>
  <p><a href="https://i.stack.imgur.com/BwWqf.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/BwWqf.png" alt="enter image description here" /></a></p>