需要帮助改进代码以运行for循环来总结csv文件中的经济变量吗？

import csv

def summarize_economic_variables(csv_file):
    with open(csv_file, 'r') as file:
        reader = csv.reader(file)
        header = next(reader)  # 获取CSV文件的标题行
        variables = {}  # 用于存储经济变量的字典

        for row in reader:
            for i in range(len(header)):
                variable = header[i]
                value = float(row[i])  # 假设经济变量的值是浮点数
                if variable in variables:
                    variables[variable] += value
                else:
                    variables[variable] = value

    return variables

csv_file = 'data.csv'  # 替换为你的CSV文件路径
result = summarize_economic_variables(csv_file)
print(result)