title: how to concatenate two columns in excel using python
body: <p>I want to concatenate two columns is <code>excel</code> and make it as a single column.</p>
  
  <p>For example : <code>column A=12 column B=778</code> </p>
  
  <p>The output should be <code>column c=12778</code></p>
  
  <p>please find the sample file in the attachment.</p>