如何解析和取消解析url查询字符串，使其以与以前相同的格式/编码结束？

import urllib.parse

def parse_query_string(url):
    # 解析URL查询字符串
    parsed_url = urllib.parse.urlparse(url)
    query_string = parsed_url.query

    # 解析键值对
    parsed_query = urllib.parse.parse_qs(query_string)

    # 对键和值进行URL解码
    decoded_query = {}
    for key, values in parsed_query.items():
        decoded_values = [urllib.parse.unquote(value) for value in values]
        decoded_query[urllib.parse.unquote(key)] = decoded_values

    return decoded_query

def build_query_string(query):
    # 重新构建URL查询字符串
    encoded_query = {}
    for key, values in query.items():
        encoded_values = [urllib.parse.quote(value) for value in values]
        encoded_query[urllib.parse.quote(key)] = encoded_values

    encoded_query_string = urllib.parse.urlencode(encoded_query, doseq=True)

    # 重新构建URL
    parsed_url = urllib.parse.urlparse(url)
    rebuilt_url = urllib.parse.urlunparse(parsed_url._replace(query=encoded_query_string))

    return rebuilt_url

# 示例用法
url = "https://example.com/search?q=hello%20world&lang=en"
query = parse_query_string(url)
print(query)
# 输出：{'q': ['hello world'], 'lang': ['en']}

query['q'] = ['你好，世界']
rebuilt_url = build_query_string(query)
print(rebuilt_url)
# 输出：https://example.com/search?q=%E4%BD%A0%E5%A5%BD%EF%BC%8C%E4%B8%96%E7%95%8C&lang=en