有如下Python程序段，执行程序后，输出的结果是？

import csv
with open('123.csv', 'w',newline='') as f:
    w=csv.writer(f)
    w.writerows([('hello','world'), ('I','love','you')])
with open('123.csv', 'r') as f:
    sp= csv.reader(f)
    for row in sp:
        print(row[0],end=',')