需求：有时候需要将GET参数转为字典再动态增加参数
注意：此代码来源Tornado源码

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import urllib.parse
from typing import Dict, List

def parse_qs_bytes(
        qs: str, keep_blank_values: bool = False, strict_parsing: bool = False, code_type: str = "utf-8"
) -> Dict[str, List[bytes]]:
    """将查询的字符串转为字典类型，并且value转为字节类型"""
    result = urllib.parse.parse_qs(
        qs, keep_blank_values, strict_parsing, encoding="latin1", errors="strict"
    )
    encoded = {}
    for k, v in result.items():
        encoded[k] = [i.encode(code_type) for i in v]
    return encoded

if __name__ == '__main__':
    ret = parse_qs_bytes("username=test&password=admin&content=中国人")
    print(ret)
    ret['type'] = 0
    print(urllib.parse.urlencode(ret))

运行结果

{'username': [b'test'], 'password': [b'admin'], 'content': [b'\xe4\xb8\xad\xe5\x9b\xbd\xe4\xba\xba']}
username=%5Bb%27test%27%5D&password=%5Bb%27admin%27%5D&content=%5Bb%27%5Cxe4%5Cxb8%5Cxad%5Cxe5%5Cx9b%5Cxbd%5Cxe4%5Cxba%5Cxba%27%5D&type=0