title: Pandas: How to relabel the index of rows
body: <p>Currently I have:
  <a href="https://i.stack.imgur.com/iszDx.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/iszDx.png" alt="enter image description here" /></a></p>
  <p>I would like the row indices on the left of product_id to start from 0 in ascending order. Is that possible?</p>