title: how to merge two data frames based on particular column in pandas python?
body: <p>I have to merge two dataframes:</p>
  
  <p>df1</p>
  
  <pre><code>company,standard
  tata,A1
  cts,A2
  dell,A3
  </code></pre>
  
  <p>df2</p>
  
  <pre><code>company,return
  tata,71
  dell,78
  cts,27
  hcl,23
  </code></pre>
  
  <p>I have to unify both dataframes to one dataframe. I need output like:</p>
  
  <pre><code>company,standard,return
  tata,A1,71
  cts,A2,27
  dell,A3,78
  </code></pre>