title: Plot bar graph from Pandas DataFrame
body: <p>Assuming i have a <code>DataFrame</code> that looks like this:</p>
  
  <pre><code>Hour | V1 | V2 | A1 | A2
   0   | 15 | 13 | 25 | 37  
   1   | 26 | 52 | 21 | 45 
   2   | 18 | 45 | 45 | 25 
   3   | 65 | 38 | 98 | 14
  </code></pre>
  
  <p>Im trying to create a bar plot to compare columns <code>V1</code> and <code>V2</code> by the <code>Hour</code>.
  When I do:</p>
  
  <pre><code>import matplotlib.pyplot as plt
  ax = df.plot(kind='bar', title ="V comp",figsize=(15,10),legend=True, fontsize=12)
  ax.set_xlabel("Hour",fontsize=12)
  ax.set_ylabel("V",fontsize=12)
  </code></pre>
  
  <p>I get a plot and a legend with all the columns' values and names. How can I modify my code so the plot and legend only displays the columns <code>V1</code> and <code>V2</code>  </p>