This isn't actually true anymore for many, many things:
- The major scientific/numerical packages support Python 3 (pandas, numpy, scipy).
- The best database library supports Python 3 (SQLAlchemy)
- A substantial fraction of important support libraries support Python 3 (e.g. lxml, PIL/pillow)
- Django supports Python 3
I'm honestly a little confused by people who claim that library support for 3.x "isn't there yet". My entire office has switched to Python 3 for everything.
CyMySQL and oursql are also viable options.