XML修改属性值怎么做

import xml.etree.ElementTree as ET

def modify_xml_attribute(xml_file, element_path, attribute_name, new_value):
    """修改XML文件中指定元素的属性值。

    Args:
        xml_file: XML文件路径。
        element_path: 目标元素的XPath路径。
        attribute_name: 要修改的属性名称。
        new_value: 新的属性值。
    """
    try:
        tree = ET.parse(xml_file)
        root = tree.getroot()
        element = root.find(element_path)  # 使用XPath查找元素，更精准高效

        if element is not None:
            element.set(attribute_name, new_value)
            tree.write(xml_file, encoding="utf-8", xml_declaration=True) #  注意编码和XML声明
            print(f"Successfully modified attribute '{attribute_name}' of element '{element_path}' to '{new_value}'")
        else:
            print(f"Element '{element_path}' not found in XML file.")

    except FileNotFoundError:
        print(f"XML file '{xml_file}' not found.")
    except ET.ParseError:
        print(f"Error parsing XML file '{xml_file}'.  Check for syntax errors.")

# 例子：
xml_file = "my_data.xml"
modify_xml_attribute(xml_file, "./bookstore/book", "category", "Fiction")