I\'m trying to run a populate script which I put together from the tango_with_django tutorial (https://github.com/leifos/tango_with_django/blob/master/tango_with_django_project/
If you're running PyCharm, what worked for me was to invalidate the cache and restart the app.
File => Invalidate Caches / Restart ...
My virtualenv had been recently updated from Python 3.6 or 3.7 to 3.8.