Database-Independent MAX() Function in SQLAlchemy

I'd like to calculate a MAX() value for a column. What's the proper way to do this in sqlalchemy开发者_运维知识库 while preserving database independence?

You can find aggregate functions in:

from sqlalchemy import func 
func.avg(...) 
func.sum(...) 
func.max(...) 

In 0.5 you can use an ORM query like a select:

session.query(func.max(Table.column))