我如何替换查询参数，而不替换其他参数？

import urllib.parse

def replace_query_param(url, param_name, new_value):
    # 解析URL
    parsed_url = urllib.parse.urlparse(url)
    # 提取查询参数
    query_params = urllib.parse.parse_qs(parsed_url.query)
    # 替换查询参数
    query_params[param_name] = [new_value]
    # 重建URL
    new_query = urllib.parse.urlencode(query_params, doseq=True)
    new_url = urllib.parse.urlunparse(parsed_url._replace(query=new_query))
    return new_url

# 示例用法
original_url = "https://www.example.com/path?param1=value1&param2=value2"
new_url = replace_query_param(original_url, "param1", "new_value1")
print(new_url)