python 读取csv文件

Posted 2020-10-18 逆水行舟，不进则退

python中有一个读写csv文件的包，直接import csv即可

新建test.csv

1.写

import csv

with open("test.csv","w",encoding=\'utf8\') as csvfile:
    writer=csv.writer(csvfile)
    writer.writerow(["index","a_name","b_name"])
    writer.writerows([[0,\'a1\',\'b1\'],[1,\'a2\',\'b2\'],[2,\'a3\',\'b3\']])

直接使用这种写法会导致文件每一行后面会多一个空行

解决的方法

用python3来写wirterow时，打开文件时使用w模式，然后带上newline=\'\'

import csv

with open("test.csv","w",encoding=\'utf8\',newline=\'\') as csvfile:
    writer=csv.writer(csvfile)
    writer.writerow(["index","a_name","b_name"])
    writer.writerows([[0,\'a1\',\'b1\'],[1,\'a2\',\'b2\'],[2,\'a3\',\'b3\']])

2.读

import csv

with open("test.csv","r") as csvfile:
    reader=csv.reader(csvfile)
    for line in reader:
        print(line)