Hi Sadra Yahyapour,
Thanks for writing this guide how to get started with PlanetScale and Python!
One quick comment on this part:
Since the MySQL engine uses utf8bm3 charset and it’s not supported by PlanetScale’s engine yet, you may need to add {'charset': 'utf8bm4'} to OPTIONS in order to migrate your changes with no problem.
PlanetScale supports the utf8, utf8mb4 and utf8mb3 character sets. Though, per the MySQL documentation utf8mb3 is deprecated and utf8mb4 should be used instead. The alias (or reference) utf8 still points to utf8mb3, but it's expected to change to utf8mb4 with a future release.