compat.py 文件源码

def compat_urllib_parse_unquote_to_bytes(string):
        """unquote_to_bytes('abc%20def') -> b'abc def'."""
        # Note: strings are encoded as UTF-8. This is only an issue if it contains
        # unescaped non-ASCII characters, which URIs should not.
        if not string:
            # Is it a string-like object?
            string.split
            return b''
        if isinstance(string, compat_str):
            string = string.encode('utf-8')
        bits = string.split(b'%')
        if len(bits) == 1:
            return string
        res = [bits[0]]
        append = res.append
        for item in bits[1:]:
            try:
                append(compat_urllib_parse._hextochr[item[:2]])
                append(item[2:])
            except KeyError:
                append(b'%')
                append(item)
        return b''.join(res)