如何将几个文件夹中的所有文件一起计算

import os

def calculate_files(folder_paths):
    total_sum = 0

    for folder_path in folder_paths:
        for root, dirs, files in os.walk(folder_path):
            for file in files:
                file_path = os.path.join(root, file)
                with open(file_path, 'r') as f:
                    # 假设文件中每行都是一个数字
                    for line in f:
                        total_sum += int(line)

    return total_sum

# 示例用法
folder_paths = ['/path/to/folder1', '/path/to/folder2', '/path/to/folder3']
result = calculate_files(folder_paths)
print("总和：", result)