title: Python: Convert column from float to int
body: <p>I am using a pandas, and need to concat two dataframes based on a <code>set_id</code> index.  One of the dataframes has these as floats (see below).  How can I convert these to ints?</p>
  
  <p><a href="https://i.stack.imgur.com/FZS7p.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/FZS7p.png" alt="enter image description here"></a></p>