如何使用2列csv文件创建字典？

import csv
from collections import defaultdict

data = defaultdict(str)  # 创建一个默认值为空字符串的字典

with open('file.csv', 'r') as file:
    reader = csv.reader(file)
    for row in reader:
        key = row[0]
        value = row[1]
        data[key] = value

print(data['key1'])  # 输出键为'key1'的值