I'm sorry the database was implemented like this. 

I believe you'll have the best luck using a CustomType or TypeDecorator
  * https://docs.sqlalchemy.org/en/latest/core/custom_types.html

Basically you would create a custom type that supports 'T' and 'F' in SQL 
but True/False in Python, and set that field/column to be that type 
(instead of String)

That will allow you to just use Booleans in Python, but generate the 
correct SQL on the database.

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