使用Python从CSV文件创建两个级别的嵌套字典

import csv

with open('data.csv', 'r') as file:
    reader = csv.reader(file)
    data = list(reader)

nested_dict = {}
for row in data:
    key1 = row[0]  # 第一级别的键
    key2 = row[1]  # 第二级别的键
    value = row[2]  # 值

    if key1 not in nested_dict:
        nested_dict[key1] = {}  # 创建第一级别的字典

    nested_dict[key1][key2] = value  # 在第一级别的字典中创建第二级别的键值对

print(nested_dict)