import csv
with open('test2.csv','w',encoding='utf-8',newline='')as f:
write = csv.writer(f)

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

import csv

with open('test2.csv','r',encoding='utf-8',newline='')as f:
reader = csv.reader(f)
for line in reader:
print(line)