Phyton service has no data

I have this python code from a service that fetches my database the 'responder' result. But I can not present this result, it only appears in this way '{"chickensAviary": "answer"}'

    @route('/matematica3/naoAutomatica/get', method = "GET")
    def matematica3NaoAutomaticaGet():
        response.content_type = 'application/json;charset=utf-8'

        cnx = mysql.connector.connect(host='**',
                                    database='**', user='**',
                                      password='**')

        cnx_cursor1 = cnx.cursor(dictionary=True)

        respostas = []

        sql1 = "SELECT resposta FROM AprendeComigo.formulario where id_formulario=0;"
        cnx_cursor1.execute(sql1)
        l=cnx_cursor1.fetchone()
        while l is not None:
            matematica3NaoAutomaticaGet = { "galinhasAviario": l["resposta"]}
            respostas +=[matematica3NaoAutomaticaGet]
            l=cnx_cursor1.fetchone()

        return json.dumps(respostas)