title: Pandas, how to remove the very first column (ordered column)
body: <p>I don't know how to name this column <a href="https://i.stack.imgur.com/rBCjx.png" rel="nofollow noreferrer">red arrow</a>, it appears every time I import &amp; export csv. The format I expect as following (without that ordered column) <a href="https://i.stack.imgur.com/QPiDt.png" rel="nofollow noreferrer">expected format</a>.
  That column is not in the list of columns as <code>df.columns</code>, it makes me confuse.
  Any help is highly appreciated please.</p>