how to run the .sql file in sqlalchemy in python

I created a postgres function and saved in a file called get_data.sql

    create or replace function getalldata(entryDate TIMESTAMP, exitDate TIMESTAMP) RETURNS SETOF employee AS $$    BEGIN            begin     -- try                    select employee.name, dept.name                    from employee                     join dept on employee.dept_id=dept.id                    where  employee.name='Kumar' and                     employee.timestamp>=entryDate and employee.timestamp<=exitDate;            exception when others then                 raise notice 'The transaction is in an uncommittable state. ''Transaction was rolled back';                raise notice '% %', SQLERRM, SQLSTATE;            end ; -- try..catch    END;    $$ LANGUAGE plpgsql;

I run this sql file in sqlalchemy

    try:        from sqlalchemy import create_engine, text        connection = engine.connect()        with open('get_data.sql', 'r') as file:            procedure_sql = file.read()        procedure_sql = text(procedure_sql)        results = connection.execute(                procedure_sql,                {'entryDate':start_datetime, 'exitDate':end_datetime}            )        results = list(results.fetchall())    except Exception as e:        print('error', e)

But I got this error

error This result object does not return rows. It has been closed automatically.

How to solve this issue, and which causes this error