title: Histogram of a dataframe
body: <p>I have a data frame as follow: 
  <a href="https://i.stack.imgur.com/OsVNm.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/OsVNm.png" alt="enter image description here"></a></p>
  
  <p>and I am trying to plot a histogram from it such that the letters {A,B,C,D} are in the x axis and y axis shows the numbers. I have tried the following: </p>
  
  <pre><code>df.plot(kind='hist')
  </code></pre>
  
  <p>for which I get the address instead of the plot, i.e: </p>
  
  <pre><code>&lt;matplotlib.axes._subplots.AxesSubplot at 0x11217d5f8&gt;
  </code></pre>
  
  <p>I was wondering how can I show the plot? </p>