CSV写入时指定表头

import csv
with open('singer_name.csv','w')as csvf:
    #新建csv表头列表
    fieldnames=['first_name','second_name','last_name']
    writer=csv.DictWriter(csvf,fieldnames=fieldnames)
    #写入表头
    writer.writeheader()

#新建singer_name.csv
import csv
with open('singer_name.csv','w')as csvf:
    #建立表头列表
    fieldnames=['first_name','second_name','last_name']
    writer=csv.DictWriter(csvf,fieldnames=fieldnames)
    writer.writeheader()
    #逐行对应表头写入数据
    writer.writerow({'first_name':'wang','second_name':'li','last_name':'hong'})#第一行
    writer.writerow({'first_name':'zhou','second_name':'jie','last_name':'long'})
    writer.writerow({'first_name':'sun','second_name':'yan','last_name':'zi'})