title: What is the pyplot equivalent of seaborn barplot?
body: <p>I want to convert this barplot:</p>
  
  <pre><code>sns.barplot(x='Pclass', y='Survived', data=train_df)
  </code></pre>
  
  <p>using the built-in plot function from Pandas dataframe or pyplot
  How can I translate this seaborn barplot into a pyplot bar chart?</p>