[tedmiston]

All models in one models.py file is common for Flask and Django.

If you use multiple apps within one Django project or the equivalent in Flask (Blueprints), that extends to one models.py per app (where a "project" is a collection of "apps").

Sometimes you'll see one file model per (with a models/__init__.py that imports them for use). While I think it keep dependency imports for each model very cleanly separated, you end up having a lot of redundancy importing the same basic pieces in every model file.