python csv写入多列

import csv
f=open('原文件路径',"r",encoding="utf8")
csvfile = open('要写入的.csv', 'w',newline='',encoding="utf8")
writer=csv.writer(csvfile, delimiter=",")
con=f.readlines()
row=["a","b","c"]
writer.writerow(row)
for line in con:
    row=line.split("\t")
    writer.writerow(row)
print("okk")

f.close()
csvfile.close()