csv 形式でのファイルの読み込み&書き込み

# -*- coding: utf-8 -*-
import csv

#csvファイルの書き込み
with open("sample.csv","w") as w:
    cw = csv.writer(w,lineterminator='\n')
    cw.writerow(["県名","県庁所在地","面積[m^2]"])
    cw.writerow(["愛知","名古屋","5172.92"])
    cw.writerow(["青森","青森","9645.64"])
    cw.writerow(["秋田","秋田","11637.52"])

#csvファイルの読み込み
with open("sample.csv","r") as r:
    cr = csv.reader(r)
    for row in cr:
        print(row)

出力結果(print(row))

['県名', '県庁所在地', '面積[m^2]']
['愛知', '名古屋', '5172.92']
['青森', '青森', '9645.64']
['秋田', '秋田', '11637.52']

参考文献

Python 標準ライブラリ>csv