【python】csv読み込み

import csv
import tkinter as tk

with open('path.csv') as f:
    reader = csv.reader(f)
    for row in reader:
        print(row[0])

p = row[0]

full = p + '\\' + 'test.csv'
with open(full) as f:
    reader = csv.reader(f)
    for row in reader:
        print(row[0])

root = tk.Tk()
root.withdraw()
# メッセージボックス（はい・いいえ） 
ret = tk.messagebox.askyesno('タイトル', 'メッセージ内容')
print(ret)