title: Creating new column names from a list of strings in a loop
body: <p>Let us say I have the following column names in pandas:
  ["A", "B"]</p>
  
  <p>My problem is that I want to use a for loop that grabs the column names from the list and creates a new column name that includes part of those elements from the list.</p>
  
  <p>In each iteration I would like to create the following:</p>
  
  <pre><code>a = ["A", "B"]
  for elements i in a:
      elements + "_c" = SOME FUNCTION column &lt;df.elements&gt;   
  </code></pre>
  
  <p>That should result in the addition of two new columns with names A_c and B_c.</p>