python文件储存-对csv文件的读取和写入

安装csv包
打开cmd 执行 pip install csv
引入的模块名为csv

读取文件

with open("xx.csv","r") as f:
    read_data=csv.reader(f)
    for i in read_data:
    print(i)//打印表的全部元素
    print(i[0])//打印表的第一列元素

写入文件

with open("xx.csv","a",newline="") as f:
//newline=""用来消除每次写入文件时空的一行
    writer=csv.writer(f)
    writer.writerow(["1","2","3","4"])//一次写入一行
    writer.writerows([1,2,3,4,5],[1,2,3,4,5,6])//一次写入多行