RFC 3986 - Uniform Resource Identifier (URI): Generic Syntax
This specification uses the Augmented Backus-Naur Form (ABNF) notation of RFC2234, (1.3. Syntax Notation)
2.1. Percent-Encoding
%20は%x20
つまり、00100000(0010 -> 2, 0000 -> 0)
10進の32
pct-encoded = "%" HEXDIG HEXDIG
the character KATAKANA LETTER A would be represented as "%E3%82%A2". (2.5)
code:python
>> unicodedata.name("ア")
'KATAKANA LETTER A'
>> hex(ord("ア")) # Unicodeコードポイント: U+30A2
'0x30a2'
>> "ア".encode()
b'\xe3\x82\xa2'
"%E3%82%A2"は「% 1111 0011 % 1000 0010 % 1010 0010」
10進で並べると「227 130 162」