title: Python - Flag row without using loop
body: <p>I would like to know if there's any function that I can use for flag (when there's pop up date. for ex:row 188,189,190...etc.) without using loop. please see attached excel file.
  Thank you so much!
  <a href="https://i.stack.imgur.com/8HEM5.png" rel="nofollow noreferrer">an example</a></p>