python 讀取csv文件

python中有一個讀寫csv文件的包，直接import csv即可

新建test.csv

1.寫

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']])

直接使用這種寫法會導致文件每一行后面會多一個空行

解決的方法

用python3來寫wirterow時，打開文件時使用w模式，然后帶上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.讀

import csv

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