<!-- This comments are hidden when you submit the issue, so you do not need to remove them! --> <!-- Please be sure to check out our contributing guidelines, https://github.com/astropy/astropy/blob/master/CONTRIBUTING.md . Please be sure to check out our code of conduct, https://github.com/astropy/astropy/blob/master/CODE_OF_CONDUCT.md . --> <!-- Please have a search on our GitHub repository to see if a similar issue has already been posted. If a similar issue is closed, have a quick look to see if you are satisfied by the resolution. If not please go ahead and open an issue! --> ### Description <!-- Provide a general description of the feature you would like. --> <!-- If you want to, you can suggest a draft design or API. --> <!-- This way we have a deeper discussion on the feature. --> Take advantage of the `:=` (walrus) operator when our minversion of Python is 3.8. ### Additional context <!-- Add any other context or screenshots about the feature request here. --> <!-- This part is optional. --> https://www.python.org/dev/peps/pep-0572/ https://www.youtube.com/watch?v=6uAvHOKofws p.s. Khoo khoo kachu!