##################################
#in separate module

from sqlalchemy.engine.url import URL
from sqlalchemy.ext.sqlsoup import SqlSoup
import sqlalchemy as sa

class SQLAlchemyTablesDict(object):
    drivermap = {
        "sqlite3": "sqlite",
            "postgresql_psycopg2": "postgres",
            "mysql": "mysql",
    }

    def __init__(self, drivername, username=None, password=None, host=None, port=None, database=None, query=None):
        url = URL(SQLAlchemyTablesDict.drivermap[drivername], username=username, password=password, host=host, port=None, database=database, query=query)
            self.engine = sa.create_engine(url)
            self._soup = SqlSoup(self.engine)

    def __getitem__(self, key):
            mapped = self._soup.__getattr__(key)
            return mapped._table


##################################
#in settings.py

SA_TABLES = SQLAlchemyTablesDict(DATABASE_ENGINE, username=DATABASE_USER, password=DATABASE_PASSWORD, host=DATABASE_HOST, port=DATABASE_PORT, database=DATABASE_NAME)

##################################
#in dao module

def my_dao_fun(par1):
    mytable = SA_TABLES["myapp_mytable"]
    conn = SA_TABLES.engine.connect()
    #...do query