CSV 文件读取

import csv

with open('file.csv', mode='r', encoding='utf-8') as f:
    #csv读取器
    csv_reader = csv.reader(f)
    header = next(csv_reader)

    print(header)

    for line in csv_reader:
        print(line)

['姓名', '年龄', '性别']
['小明', '17', '男']
['小王', '18', '女']
['小张', '19', '男']

CSV 文件写入

import csv

l1 = [[1,2,3],[4,5,6],[7,8,9]]

with open('./file.csv', mode='w',encoding='utf-8') as f:
    csv_writer = csv.writer(f,delimiter='*')
    for line in l1:
        csv_writer.writerow(line)