I should have explained something above better...

The result I assumed you wanted to achieve is "creating SQL that will 
handle data transformations".  That would allow you to write concise python 
that will compiled into SQL which will be evaluated on the database 
server.  You could also use other approaches that transform data in python 
before hitting the database server.

IMHO, using a custom compiler approach is easier than trying to do 
something with `sqlalchemy.func` because it gives you more room to 
customize how the sql compiles under different databases.

SQLAlchemy - 
The Python SQL Toolkit and Object Relational Mapper


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