如何正确地从.csv创建XML？

import csv
import xml.etree.ElementTree as ET

def csv_to_xml(csv_file, xml_file):
    # 打开CSV文件并读取数据
    with open(csv_file, 'r') as file:
        csv_data = csv.reader(file)
        header = next(csv_data)  # 获取CSV文件的标题行

        # 创建XML根元素
        root = ET.Element('data')

        # 遍历CSV文件的每一行数据
        for row in csv_data:
            # 创建XML子元素
            item = ET.SubElement(root, 'item')

            # 填充子元素的标签和值
            for i in range(len(header)):
                ET.SubElement(item, header[i]).text = row[i]

    # 将XML根元素转换为字符串
    xml_str = ET.tostring(root, encoding='utf-8')

    # 将XML字符串写入XML文件
    with open(xml_file, 'wb') as file:
        file.write(xml_str)

# 示例用法
csv_to_xml('data.csv', 'data.xml')