如何在未绑定的xml结构中生成逗号分隔的字符串

import xml.etree.ElementTree as ET

def generate_comma_separated_string(xml_string):
    # 解析XML字符串
    root = ET.fromstring(xml_string)
    
    # 遍历XML节点并提取数据
    data_list = []
    for node in root.iter():
        # 这里假设需要提取的数据在<item>标签下
        if node.tag == 'item':
            data_list.append(node.text)
    
    # 生成逗号分隔的字符串
    comma_separated_string = ','.join(data_list)
    
    return comma_separated_string

# 示例XML字符串
xml_string = '''
<root>
    <item>data1</item>
    <item>data2</item>
    <item>data3</item>
</root>
'''

# 调用函数生成逗号分隔的字符串
result = generate_comma_separated_string(xml_string)
print(result)