如下所示：
//用普通文本文件方式打开和操作
with open("'file.csv'") as cf:
lines=cf.readlines()
......
//用普通文本方式打开，用csv模块操作
import csv
with open("file.csv") as cf:
lines=csv.reader(cf)
for line in lines:
print(line)
......
import csv
headers=['id','username','password','age','country']
r
