如何将XML属性填充到字符串(最好是可观察的列表)

import xml.etree.ElementTree as ET

def fill_attributes_to_string(xml_string):
    # 解析XML字符串
    root = ET.fromstring(xml_string)
    
    # 创建一个可观察的列表，用于存储属性值
    attribute_list = []
    
    # 遍历XML元素
    for element in root.iter():
        # 获取元素的所有属性
        attributes = element.attrib
        
        # 遍历属性并将其填充到字符串中
        for attr_name, attr_value in attributes.items():
            attribute_list.append(f"{attr_name}: {attr_value}")
    
    # 将属性列表转换为字符串
    attribute_string = '\n'.join(attribute_list)
    
    return attribute_string

xml_string = '''
<root>
    <element1 attribute1="value1" attribute2="value2" />
    <element2 attribute3="value3" />
</root>
'''

attribute_string = fill_attributes_to_string(xml_string)
print(attribute_string)

attribute1: value1
attribute2: value2
attribute3: value3