title: Plotting single data point using seaborn
body: <p>I am using seaborn to create a boxplot. But how would I add a line or a single point to show a single data value on the chart. For instance how would i go about plotting the value 3.5 on the below chart. </p>
  
  <pre><code>import seaborn as sns
  import matplotlib.pyplot as plt
  
  df1 = [2.5, 2.5, 2, 3, 4, 3.5]
  sns.set_style("whitegrid")
  fig, ax = plt.subplots(figsize=(8,8))
  plot1 = sns.boxplot(ax=ax, x=df1, linewidth=5)
  </code></pre>