Python - gurdar valores de una tupla en variables

(datetime.date(2008, 8, 10), datetime.date(2008, 8, 15),)

def fecha_min_max(tabla):

    q = "select min(fecha_s) as fecha_s_min, max(fecha_s) as fecha_s_max from "

    q = q + tabla

    res = run_query(q)

    return res

def run_query(query=''):

    datos = [DB_HOST, DB_USER, DB_PASS, DB_NAME]

    conn = pymysql.connect(*datos)

    cursor = conn.cursor()

    cursor.execute(query)

    if query.upper().startswith('SELECT'):

        data = cursor.fetchall()

    else:

        conn.commit()

        data = None

    cursor.close()

    conn.close()

    return data

a=((datetime.date(2008, 8, 10), datetime.date(2008, 8, 15)),)

a[0] # devuelve (datetime.date(2008, 8, 10), datetime.date(2008, 8, 15))

a[0[0]] # devuelve datetime.date(2008, 8, 10)