title: Appending a dataframe to the right of another one with the same columns
body: <p>I have two different dataframes with the same column names:</p>
  
  <p>eg.</p>
  
  <pre><code>     0   1   2
  0   10  13  17
  1   14  21  34
  2   68  32  12
  
       0   1   2 
  0   45  56  32
  1    9  22  86
  2   55  64  19
  </code></pre>
  
  <p>I would like to append the second frame to the right of the first one while continuing the column names from the first frame. The output would look like this:</p>
  
  <pre><code>    0   1   2   3   4   5
  0  10  13  17  45  56  32
  1  14  21  34   9  22  86
  2  68  32  12  55  64  19
  </code></pre>
  
  <p>What is the most efficient way of doing this?
  Thanks.</p>