Python urlencode与urldecode的使用

需求：有时候我们GET方法参数的特殊符号，如果没有编码就会被截取，这里时候，就需要客户端需要urlencode，服务端：urldecode来进行处理
注意：此代码来源Tornado源码

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

import typing
import urllib.parse
from typing import Union, Optional

_UTF8_TYPES = (bytes, type(None))
unicode_type = str

@typing.overload
def utf8(value: bytes) -> bytes:
    pass

@typing.overload  # noqa: F811
def utf8(value: str) -> bytes:
    pass

@typing.overload  # noqa: F811
def utf8(value: None) -> None:
    pass

def utf8(value: Union[None, str, bytes], code_type='utf-8') -> Optional[bytes]:  # noqa: F811
    """ utf-8编码"""
    if isinstance(value, _UTF8_TYPES):
        return value
    if not isinstance(value, unicode_type):
        raise TypeError("Expected bytes, unicode, or None; got %r" % type(value))
    return value.encode(code_type)

@typing.overload
def to_unicode(value: str) -> str:
    pass

@typing.overload  # noqa: F811
def to_unicode(value: bytes) -> str:
    pass

@typing.overload  # noqa: F811
def to_unicode(value: None) -> None:
    pass

_TO_UNICODE_TYPES = (unicode_type, type(None))

def to_unicode(value: Union[None, str, bytes], code_type='utf-8') -> Optional[str]:  # noqa: F811
    """字节类型转为字符串"""
    if isinstance(value, _TO_UNICODE_TYPES):
        return value
    if not isinstance(value, bytes):
        raise TypeError("Expected bytes, unicode, or None; got %r" % type(value))
    return value.decode(code_type)

def url_escape(value: Union[str, bytes], plus: bool = True) -> str:
    """
        url编码的功能
        plus=True 表示空格用+替换
        plus=False 表示空格用%20替换
    """
    quote = urllib.parse.quote_plus if plus else urllib.parse.quote
    return quote(utf8(value))

def url_unescape(  # noqa: F811
        value: Union[str, bytes], encoding: Optional[str] = "utf-8", plus: bool = True
) -> Union[str, bytes]:
    """
        url解码的功能
        plus=True 表示空格用+替换
        plus=False 表示空格用%20替换
    """
    if encoding is None:
        if plus:
            # 将字节类型转为字符串类型，并且替换+号为空格
            value = to_unicode(value).replace("+", " ")
        return urllib.parse.unquote_to_bytes(value)
    else:
        unquote = urllib.parse.unquote_plus if plus else urllib.parse.unquote
        return unquote(to_unicode(value), encoding=encoding)

if __name__ == '__main__':
    url_escape_ret = url_escape("username=test&password=admin&content=中国  人", plus=False)
    url_unescape_ret = url_unescape(url_escape_ret, plus=False)
    print('编码', url_escape_ret, type(url_escape_ret))
    print('解码', url_unescape_ret, type(url_unescape_ret))

运行结果

编码 username%3Dtest%26password%3Dadmin%26content%3D%E4%B8%AD%E5%9B%BD%20%20%E4%BA%BA <class 'str'>
解码 username=test&password=admin&content=中国  人 <class 'str'>