[mcbetz]

I especially like, that I can use Flask-Admin with Peewee ORM - https://peewee.readthedocs.org/en/latest/ - instead of SQLAlchemy, because I feel so much more comfortable with Peewee when doing small CRUD projects. SQLAlchemy is a lot more powerful, but the learning curve (at least for me) is steeper than with Peewee. Flask-Admin is a beautiful piece of software to get Flask backends set up quickly.

[rudolf0]

Seconding this. Peewee is a breeze to set up and use compared to SQLAlchemy.

[jsmeaton]

I haven't used it myself, but I took a good look at the code for PeeWee for some changes I wanted to make to Django. It's incredibly well written, and weighs in at about 4000 LoC including 3 database specific dialects (pg, mysql, sqlite).

For anyone interested in how an ORM could be implemented, check it out: https://github.com/coleifer/peewee/blob/master/peewee.py