How to call SQL functions in pyodbc

Question

I have recently been working on database project, including SQL. I have written a simple function in SQL Server that counts the sum of some one of the columns.

ALTER FUNCTION [dbo].[Count_kontrakty_sum](@id_z INT)
    RETURNS INT
AS
BEGIN
    RETURN (SELECT SUM(Kontrakty.wysokosc)
            FROM Kontrakty
            WHERE id_zawodnika = @id_z)
END

When called as a database query, it works perfectly

PRINT dbo.Count_kontrakty_sum(66);

But when I want to call it from my Python program it gets a bit different.

I have tried a lot of different formats of calling this func, but every time I get some error:

cursor = conn.cursor()
cursor.execute('{CALL Count_kontrakty_sum?}', 60)
record = cursor.fetchall()

I get this error:

pyodbc.ProgrammingError: ('42000', '[42000] [Microsoft][SQL Server Native Client 11.0]Syntax error, permission violation, or other nonspecific error (0) (SQLPrepare)')

cursor.execute('exec dbo.Count_kontrakty_sum?', 66)

results in:

pyodbc.ProgrammingError: ('42000', "[42000] [Microsoft][SQL Server Native Client 11.0][SQL Server]Could not find stored procedure 'dbo.Count_kontrakty_sum@P1'. (2812) (SQLExecDirectW)")

Is there another way to call SQL function in pyodbc ?