python中把数据存入csv中

import csv

# 如果不添加newline=""的话，就会每条数据中间都会有空格行
with open("test.csv","w", newline="") as csvfile: 
    # 初始化写入对象
    writer = csv.writer(csvfile)

    #先写入columns_name
    #writer.writerow(["index","a_name","b_name"])
    #写入多行用writerows
    writer.writerows([[0,1,2],[1,2,3],[2,3,4]])

得到结果：