TypeError: can't escape tuple to binary

def     LoadDataFile():
    cursor = connections['default'].cursor()
    file_name = os.listdir('/home/task/tmc')
    for item in file_name:
        f = open('/home/task/tmc/'+item,'rb')
        data = f.read()
        f.close()
        (path,ext) = os.path.splitext(item)
        path = path.encode("utf-8")
        print item
        cursor.execute("SELECT count(*) FROM t_tmc_docs WHERE t_filedata IS NULL AND t_rec_id='%s'" % (path))
        data = cursor.fetchone()
        if data[0] == 1:
            cursor.execute("UPDATE t_tmc_docs SET t_filedata=%s WHERE t_rec_id=%s;", (psycopg2.Binary(data),path))
            transaction.commit_unless_managed()